Malicious PDF — malware analysis report

Static analysis result for SHA-256 9366ba06ca4bdaab…

MALICIOUS

PDF

77.3 KB Created: 2021-09-21 05:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb55d7896679a9919ac247136b0869ef SHA-1: fbc403953ec3d6643a0ae4f77df47fed4c173fc6 SHA-256: 9366ba06ca4bdaaba5f42babdbe43c2b2d61ff1a29503a1730cbdb78a0a91f3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=android+manage+passwords PDF link annotation
    • http://zoldjogsi.hu/uploads/files/48923720660.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6a6635df---damisagisenapozapog.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/31277184923.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/6pj0a1jn18m9venu8c0bqd6vaa/51474718622.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/pasowepolitulafakilegabub.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/xuruvipijenufurunidewuwom.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/3221343039.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/30689767277.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109082346165698.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/14592667373.pdfIn PDF document text
    • http://arucax.am/user_images/file/99024682854.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb02ec3ed3---88110402276.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc595443e---17541232196.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6133CA6085C94.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/41819134899.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/34085024647.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_off0000c686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC686 10656 bytes
SHA-256: b8ec57402b0437b83fe62d10412d089f4612017662285463ec325e7c70bde96f
font_01_sfnt_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 18936 bytes
SHA-256: 5329d7de41bd9cfb2fe458606b11309ce73cb952f8c54da3184f5242500b158a

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