Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d868b603d08937…

MALICIOUS

PDF

89.7 KB Created: 2021-09-10 03:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 029a389ae743586216004e98b513efb1 SHA-1: bce6cab88d5be45a1582c67979cbe4257f971d62 SHA-256: 08d868b603d08937be05b826175329de04d425ddfd75bc5fb7939da4ae2776a2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns are consistent with a link farm designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
  • 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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613328b058e12---3919031234.pdf In PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/ruberosajobaladixi.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/runanatisosijuvu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134228396d7a---77375632660.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/74840268454.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b02ac8bfdd949e2e19ccd0e0efe2efdb/veromidi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8acb6544b54b51a680a7ebe0149989a/43936551388.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/54561393492.pdfIn PDF document text
    • https://electroagro.es/pub/files/zutidusizili.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/kapudebu.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/zojuxisa.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/datapipaseted.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/78232891424.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/dovalapojibu.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/tolalirepajenaga.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/xogideduvasupebe.pdfIn PDF document text
    • http://moneymaker-gold.de/files/93024600623.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/99342408828.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/95111054930.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/rasaposewodiwu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1a2a1fbc4---xifelebugubujexuze.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210908_123709_156.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/14113479324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=susan+sontag+illness+as+metaphor+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378cb32f96a---3587745259.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_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 18748 bytes
SHA-256: f5ec7d044631e430475e7eed5ee660c54fc03ebe9d79a96ccbf62a616503cb6b
font_02_sfnt_off00013fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEF 11120 bytes
SHA-256: d38bd4e91334f6a621c3e29f680d5c65f347d6b611e034ed1487eff1f770b4b9

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