Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d3596794ea5501…

MALICIOUS

PDF

90.1 KB Created: 2021-09-04 06:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d9e30b0b70bc4ff8c8cc0576f23165a1 SHA-1: fb340d91c89c97e16ad1aa712d5a74a249049ee4 SHA-256: d3d3596794ea5501c001bb5efa7301e0203cc0bf1400c6890aaaf3ff5e375b96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://iberia-ex.com/images/blog//file/noxigimorawetabenumudonas.pdf In PDF document text
    • https://solelane.com/ckfinder/userfiles/files/gezavijadovinudakajexedu.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/jifafiwizigexebas.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c644583a3a7---6822725478.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/jizerozetenijixozigoviga.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/27908631159.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ecd4e13e9---vawigiziwarafesi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/84fhh8qm1kne485dopk3bisnr1/xobivesowikubarixa.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/22292216984.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/pobiwebibudogexomas.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aef8783e7---15546356098.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/15631748302.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/45788078079.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/simakazutupogen.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec314261a6---16428349.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/xixutijasitojeko.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/79ed6c0d880f0eab92a6959eec60b6fc/85759820679.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/patozonuwugava.pdfIn PDF document text
    • https://anakmeong.com/contents//files/sajokakevope.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/mopugudipofadonabepara.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0200a084f---12809383652.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/7621289111.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/tovarenes.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/33312423169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=renault+grand+scenic+2018+manual+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_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 18208 bytes
SHA-256: 55bdf338bd13083d11aa066d68d424be48aa02c25e7222b358aaa958d211f933
font_01_sfnt_off00012749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12749 11492 bytes
SHA-256: 21f05c0043687f9311df5a383bf2e4b0227ffbec49a2af72a7898588a5dfba84
font_02_sfnt_off0001425f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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