Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd770ce91bba067…

MALICIOUS

PDF

98.7 KB Created: 2021-06-26 03:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f7a37bb91c9b6a714a578d075efe623a SHA-1: f83351237583c61e4ccad6d7f0d0bcaa3b2f9108 SHA-256: ffd770ce91bba067d4e86c2cda6af8f5c73d1f58add08ea42332a81f049d35f1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The presence of 'cmd61/netulidir.pdf' within the document text suggests an attempt to disguise or execute commands, potentially leading to further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=past+participle+of+bought PDF link annotation
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/1e3343342475424b4c9c6e6da56ec4bb/12806570225.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7f6ad1a460becb7032149f5ecbae83dd/21326990112.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qjdjvg79o39bmqg2aro6b9fp40/falaluvoxom.pdfIn PDF document text
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/3art67ukn4mnt810p3lp67n9o7/tanobili.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/7sjmromhkrp57mp3rqcvgcmd61/netulidir.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ccdb4c5bea9---7401387309.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f92b0b71ae0b58b085e1a6fd16436071/mivubavadinowegorava.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f478ee3ae3---lawepur.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092ac908695f---japotenazotozetu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a759b7b7e23---7585860253.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-26/20210626053601473831.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24ab291278---woripekukasabevut.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/3825f546a85623bbf04aa7e233304bad/motanamiruxizinepeze.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/vewoxezekikiti.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/20596ff57b4bbf6433879b254e4d05ca/25706252498.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098676da79db---1483897776.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/pimerijotiga.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160743cf54dcb4---95524114927.pdfIn PDF document text
    • http://gtshotel.it/images/file/11492806678.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/eij3kdgvdnerhbof12t53n761q/lujuwixubiwukuda.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/rprv0ljr5lb6emv7cn0b94mup6/banagukomowowabovovufax.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d034cf6f5---91653970578.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210604_085014.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/68ba9bf8ed862cf78a8dc1f79a16da32/jorumivukibiwegodozokokew.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/In macro / runtime command snippet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 21364 bytes
SHA-256: c28bfee7c0b57176157aca5d28682b45019f038f6f94f14a9a0d454002993ad5
font_01_sfnt_off000124d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE6 3888 bytes
SHA-256: 532ebb8ada2901c9791517b224e996e0ceb2ef4c33ecf5e03393b2366d285183
font_03_sfnt_off00014bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BED 10896 bytes
SHA-256: 816ad511f9750aefb0cf07ca52fa7e5faf90af75d3f287b1e3d684faa8f4624f
font_04_sfnt_off00016511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16511 16684 bytes
SHA-256: 2f36c960825ad5fbc80b7de1090dc9beb851da249961294d65a15d34144cc679

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