Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f884cfe4d4236b7…

MALICIOUS

PDF

84.8 KB Created: 2021-07-16 20:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5f8135416a4e20c24285f65fe3701905 SHA-1: 11f5cbce82c54b6d5e600978dc9c3d75d05f2b38 SHA-256: 4f884cfe4d4236b78285a4a1a1e7a5c1ca7169d740801b6f40e9f24ba3efad76
204 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, designed to obscure the ultimate destination. The presence of 'invoice' and 'MFA lure' heuristics suggests a social engineering tactic to trick users into clicking malicious links, likely for credential harvesting or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://fishboat.hr/files/lumofujajiti.pdf In PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8bfa0e1ced4e75e6ab745383c9a2fad9/40825254529.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/livun.pdfIn PDF document text
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/63886648717.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/40360363762.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/juzakezewepufemokim.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/9uh6v0d1k35qvrvrccpuuun628/53858735873.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4vd0kka3755nd9pura0q634um5/gexazimaxapawutorutoxevaf.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e8a70a7aa62794b8ee34045ea7ff94c1/27591186813.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/sunimiretinujogaza.pdfIn PDF document text
    • http://aps-mes.com/files/file/ranip.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/rcq4kmafp31u1pdf15r3kk96ks/jokuwilaloxori.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4f23836ddd2197de9872f3ecda137493/99289946780.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/zoxenavusedalisi.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/modonegabolevekinugudilej.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/56422335713.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a926a1d0a0ee8a44e2439e4d8939da67/doguxoduxituzufiniwiwised.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607814d3d6128---walufelavasurorekokenuviv.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2d210e7a9---64930159029.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/k8v7smr9jne2bkft67jdo8e4m7/79743829646.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/firobinefoseraz.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/majaviraxinapovonabag.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/jomikevuwotudegex.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/95496938344.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/4545003412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=utah+county+marriage+recordsPDF 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_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 17484 bytes
SHA-256: 04656cf483e29f579c53c440e14e21cd4d8dc2aa2d19401e76e6db7a1ccb2b73
font_01_sfnt_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAA 10992 bytes
SHA-256: 4c4509c2ae1700bd616539c0dc74e312cf333d5e1762716a9a4794d6b39e5d5d

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