Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a9733db9284c30…

MALICIOUS

PDF

93.8 KB Created: 2021-07-27 14:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1693a10cb17dbfd1e5168ea0eb27045c SHA-1: e2961192773de9f538a50134396f12c9bb38e880 SHA-256: 04a9733db9284c306532fe647471d5a2cc7564e4b07477e5c60f7d217270ffed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the presence of a link farm and high detection scores justify the assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da88f26ef22---zutasolore.pdf In PDF document text
    • http://inncredel.com/uploads/pafowewe.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f5a8a95b774753182406bc6dd36e3787/lakeferif.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a2470647db8---xawojoga.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a89424736---9257876352.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/28381529239.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085805998b61---koluxin.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/15318324491.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80c44619bb---44357752718.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/fomobigomudazefaperu.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/3921494444.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/eb1ecfbbn449pgt62emf4fgk3c/89083502013.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/43552553316.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd84ab9c7cc---98726612547.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a7884fcd2---9358375403.pdfIn PDF document text
    • http://bscartridge.com/pic/xosizixagijebolatubejelu.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/92051934681.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5203b15405562667f620b95dad29e063/vazojitixuxalumoxupibubek.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/daxuta.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f4e30f4fc---witapufurerizudug.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66a0ccb2f2---riluwabup.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/lipomalusoteduk.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f721b1a01---gafejabajoxom.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3e02f235f---xejev.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/13137645281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=close+reading+worksheet+high+school+pdfPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 16760 bytes
SHA-256: 2ce50eeea08cd4cc64912b5e8bf8cddf9c1a648ae182a9976aab0a476f6a4fb2
font_01_sfnt_off000136ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F04 11108 bytes
SHA-256: b83658803ab6d368474d382d73b583eef34249ca43b460b90a87496ce4437f4d