Malicious PDF — malware analysis report

Static analysis result for SHA-256 904604e7837d706f…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 23:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eed46da7b6f1d47e764fdc225c239f9e SHA-1: 8da1b2ef141746b29decd77a6416a6401d3e40a3 SHA-256: 904604e7837d706f9e3b1d3caa8f2d31ff8dd5c1cfecb91ec4b4c0a59b14d21f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate the document's purpose is to host and distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://x-site.by/upload/editor/files/xemalalaxewon.pdf In PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/ninexizaxoriwu.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/27314427495.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/23136158892.pdfIn PDF document text
    • http://actinq.nl/upload/file/58529612091.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/dupeti.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/xakufofak.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/191816485.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/pupamuzotuxosabipaguseme.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/borexivamunefidil.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/dukofazanewefobubetika.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/7309050733.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/cee92068c7780b7aba27369d0343ac25/1789785721.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/89174706180.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/50331867547.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161302e130679a---perunexirorirupaxojaka.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/dijab.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/miwepofapezemerenara.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/93333266672.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16151528ebe02e---sapixujogexir.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ufu90itg7iqd2suoqch47mc0m4/60209945286.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/32428978440.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/rerufisijolixudakowag.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/zisulowaporaderidixeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+best+assistant+for+androidPDF 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_off0000afee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEE 10536 bytes
SHA-256: bedca0fef44d689521dbc025e3fb7d6b851e78d8d2ba2bf481d5cc1fbfd4e35e
font_01_sfnt_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 15128 bytes
SHA-256: d060175a36b202dcffc5055de4390cd8f626fcfee71c1a2105314dd4cd48f307
font_02_sfnt_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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