Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1b9910e4e946b5…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 16:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22075e1ce05f9542cc181f1c82be2cad SHA-1: a5666812e33ee1403546e229ba3fab4df7845285 SHA-256: ef1b9910e4e946b5e08a2ef2e18c10a9f7b06c1aa443bddfc19ed3ff04661877
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, some of which are hosted on compromised CMS platforms, suggesting a link farm or redirection mechanism. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt the user to call a phone number, a common tactic in phishing and tech support scams. While no scripts were directly extracted, the presence of external links and the callback lure strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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.
  • 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://peusch.lu/userfiles/files/30025744154.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb2617da7e---10878715532.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/0df15c71707d7d3c4f1531f1b5ff545c/8619218127.pdf
    • http://alfavit.tv/userfiles/file/27764734251.pdf
    • http://nhahanghienminh68.com/upload/files/51963875212.pdf
    • http://www.jindatunnel.com/up_files/file/vaxinubixawi.pdf
    • http://abw10thstreetne.com/uploads/files/logudelilanutisidabojodu.pdf
    • https://mayxaydungthienlong.com/uploads/files/files/jegikoriv.pdf
    • http://yameitecl.com/ckfinder/userfiles/files/20210907_232038.pdf
    • http://ccspatti.org/userfiles/file/70363733980.pdf
    • https://specialgarden.ro/userfiles/file/89226134599.pdf
    • https://homeuu.biz/upload/ckeditor/pages/files/banozaperologas.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe91feaec7---68878997598.pdf
    • http://tatnhapkhau.com/ckfinder/userfiles/files/84801506485.pdf
    • http://archpiudue.com/userfiles/files/tepudesoju.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/61e07f7ba3c0b89e44f45fc8c61f7daa/80089332537.pdf
    • http://teplorium.su/userfiles/file/mivaxeritaven.pdf
    • http://jagdrevier.hu/upload/images/file/dibifipamovivuxag.pdf
    • http://studio-rivetti.it/userfiles/files/vigel.pdf
    • http://lezeckastenakosice.sk/upload/files/45879052765.pdf
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/dabonuwa.pdf
    • http://asiavent.com/UserFiles/file///4981256848.pdf
    • http://hytechplus.com/userfiles/file/dujijibi.pdf
    • https://pasarangroup2.com/contents/files/72970093272.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ef1f9deb3c72593710388cb341db2398/walogebex.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/43197701575.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161381dabf2246---36048603552.pdf
    • https://minhgianggroup.vn/upload/files/donawalege.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gta+v+cheat+codes+pc+weapons
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e602.bin
84952105664f552398a7e1a14f889755d8ae8bf9ad1222449053a662b5d1f336		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 10564 bytes
font_01_sfnt_off0000fe2a.bin
832729ef991285b9f4a49995e82d698b3c328efc7efbf2537fe9850458146be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 17272 bytes
font_02_sfnt_off00012b3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3F 16792 bytes

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