Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fe0cf18216546d…

MALICIOUS

PDF

79.7 KB Created: 2021-05-10 03:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a0cf11b2e2830ddd27a3cb3ea35a108 SHA-1: 21d25d50d054dd0dbc4d8591723b25e33f72df55 SHA-256: 82fe0cf18216546d6573b3d1320d3e0ff209d0ff21117093b7ef287b6ffa5a05
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute phishing content or malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8704

Heuristics 5

  • 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
  • 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://garglob.ru/uplcv?utm_term=adanga+maru+full+movie++tamilrockers+isaimini
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/p6sjoi6qla02upeot82t38ks39/nomesuram.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/2a28a1a3a2d9b7421f92bc758e3ce4c8/tebejumepepukoxax.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/c494639c1bec65a9d6ce95f97f7115f6/bozerorizovebejibo.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936e62e4d44---dikulepipokepuxaned.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/a0a8356ba0f083b277413c88f5ce7a5f/15516324987.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/05b9f527f0e3de1e75b9b73dfbd0388b/wanif.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f42653fcd4---vusodalizapa.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2e3ba2fa---xaxakilukuni.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16075243185cbe---47567638776.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/aki830lm6qcvbe991muhju7kh6/worakizikegokoji.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/994085a305f141c308d831dac8a1e6f4/webolosura.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/6c6643c9c93a07f325984321b476970c/letudemovegejufugigodena.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56789954c---somozinoji.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/84292773667.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/rhq4pfbqrk2cn1mdfag2scpfcv/61380794775.pdf
    • https://arhometutor.com/userfiles/file/10261365698.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f84b706ca7---43052099141.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012caf.bin
f8edbf8014ccffee98f9a0eaf374acee08d6c3891f59a47e626f2e92672703fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAF 5452 bytes

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