Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31a7edf6c6cf3f7…

MALICIOUS

PDF

72.9 KB Created: 2021-09-20 20:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46857d781054eace1f8745125fddf772 SHA-1: af5a53956e86b9e09897dbeabdb4b888aba03b92 SHA-256: e31a7edf6c6cf3f7d597e0c968f581d01e357eb88f16fd5cffbd152be1fe3f2e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to attract users through SEO-optimized keywords, leading them to potentially malicious content. The presence of multiple URLs hosted on various domains, including those flagged as compromised CMS uploads, indicates a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9771

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://chcial.ru/uplcv?utm_term=mod+apk+pubg+lite+hack PDF link annotation
    • http://phfamilyrestaurant.com/uploads/files/lubuz.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/nuzinagapijipufuvela.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/51230504970.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/12371303238.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/29630048956.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e74359578b---30354070470.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/xinadonebezawaf.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/jopenevulu.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/wajodofinabibevabadinajep.pdfIn PDF document text
    • http://insei.eu/userfiles/files/tavilidadomiwug.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/latutuvepabil.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/duvexemalebabisigizumiw.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/97002154964.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614121febb86b---lisene.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161461bcc7d541---gufarufitite.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/pekozexagevuwat.pdfIn PDF document text
    • http://renknh.com/ckupload/files/6812696951.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/94164595224.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u4p2lngdr5gqqfd89rfbmr97t4/41122309202.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/wufagimuxadanukumok.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/63432384004.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/58778079621.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/77819565042.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/56039402177.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/55433731905.pdfIn PDF document text
    • http://exosushi.com/uploads/files/10157436427.pdfIn 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_off0000b6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EE 10744 bytes
SHA-256: 453658d27dfe194143fbc1a7f24dd033696e7c8524ecf861388fcd3d35dd8294
font_01_sfnt_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 20556 bytes
SHA-256: 3b1b99742e7ec9a038997bfc39ec8a79548ff0f207d63309416b12b0c78640cf
font_02_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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