Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aea85efd5047fe1…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 10:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ebb8599d132f8d5d9d9750c59ea220bc SHA-1: b9f9642b0a436c8d3ea694146063855a69c0ab06 SHA-256: 3aea85efd5047fe1a6f3965beeb5f97831f45d481acb502faf2781c3c64da644
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/ff937b247155c03781d96d5be0f14e0e/82745338151.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/ramir.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/winesepepapasefomilivof.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/sigopawilu.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/67309605625.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fce9a1b6aa---82847351900.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/dirusuwisekuginutep.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/wobilamimuzu.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/basumuwenogezexenaliwix.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1624018990.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc5b3dca651baed0b94bfb6b09eb5f65/34594833587.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210630034902.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/48388702897.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/fasikopajelid.pdfIn PDF document text
    • http://short-story.ru/upload/file/33986628389.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a81bd582f59b3fee1e2064795a4b15dd/22960596490.pdfIn PDF document text
    • https://olterus.org/contents//files/72840946626.pdfIn PDF document text
    • http://svx.su/ffile/file/90686005587.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4a894de775dff15455762f37e24aba7c/farusefiruwatiki.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/40038100495.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7aaf26ad0389b70257da67d4c20fe0ab/99696928444.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/43040321651.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/dec5d1ba7f0aa77ba8b6ab5a3c9d0080/61194677365.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/13659227897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=emotions+vocabulary+worksheet+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_off0000cb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB97 11468 bytes
SHA-256: c656b34d928731664e9f8b8f62232d5447421d151cb07f8a3e77cce62568406f
font_01_sfnt_off0000e65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 17736 bytes
SHA-256: 548b3a350f1213b204a71372330bb9d1a9338f7c7b67d057b14ecd727eb43c30
font_02_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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