Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc7ed76c573e1bed…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 08:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 747f26624b3e2e3faa66fe1e48427de0 SHA-1: e6cac84bbeb6da36530d06228822fd84b55d6bd6 SHA-256: cc7ed76c573e1bed058fed60647786298a86da77a01ff33248d71b4d8941e02c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Multiple heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, aiming to trick users into interacting with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=delete+playstore+history PDF link annotation
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/pagunalurulurozulafi.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/63553614406.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/zadadepe.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/naxiwelabapuv.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/82727341494.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/senelimur.pdfIn PDF document text
    • http://minhanh.com/files/romorowevadevokazevav.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/tarapujifenikepiluv.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caa34141c9---gimeritixifuxopegavuj.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a84332060e---kerixami.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/lemalujupebiniteriwujokow.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e3fe85ff04a66038c6b184132d2bdcb2/novosu.pdfIn PDF document text
    • https://partetesal.ir/data/file/fubobuxolaluwotaze.pdfIn PDF document text
    • http://secoinblock.com/upload/files/79576828804.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/wabetigorupetikunigegej.pdfIn PDF document text
    • http://movediary.com/userfiles/file/16250991616.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/segaxojuvunojexu.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/93418409800.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/32752337345.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/62968831170.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/16894565480.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/wadisode.pdfIn PDF document text
    • 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_off0000d0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 10360 bytes
SHA-256: 85614f7b4997c0be5741724ba56d8a5cc7162ba1d5d791228ccdeb74ca0bf1e4
font_02_sfnt_off0001008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 17476 bytes
SHA-256: 563cc1585c504d111dca8e5b7b5fb43226fdefdb7c384fa552d39f891be877ab

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