Malicious PDF — malware analysis report

Static analysis result for SHA-256 c903ed9817afc802…

MALICIOUS

PDF

78.6 KB Created: 2021-09-01 22:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 048beadb29e6a886c12915370693942e SHA-1: b50e92facd01e535ac2cbe8ae3083201258af1a1 SHA-256: c903ed9817afc802c53bfa152cc8a57389c84a148322e6b87757684a1dd380d7
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://queure.ru/uplcv?utm_term=how+to+write+equations+in+matrix+form PDF link annotation
    • http://bisenzia.it/userfiles/files/73350153929.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe175cea72---64130285207.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081593ce233a---69402612024.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/20b5302b1e0e1243b294ee6a7d85f8f9/63663104889.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/meleg.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7e8k49noih1ctk5tqlgk36j8c2/8231221911.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/cdcaa2fcb566dbbe9dc433ee29a3ddd9/lufufajarotufe.pdfIn PDF document text
    • http://bulmarconsult.com/files/50657367475.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0777b7eba---1924925070.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/tiwulozazebexemofodip.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/tagevomuparow.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/xofunovozudutitozimusat.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/25915569224.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/76584925925.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/42191544644.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3061ad7951---daberovipoxafuva.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/20266915365.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/88747485346.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/22524e270cf92086d260683695c79656/98532360740.pdfIn PDF document text
    • http://scantech3d.com/files/taxusekesumezadizega.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5dc5082da7273e81a299029c434220d3/xozekovulezes.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3553e6bce18ba315961ca8d6e36cc587/13699807052.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/31108662465.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/33920314948.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5F 18204 bytes
SHA-256: 6862c4f3d6a6ff7889404cf071881811fb34d08bdae72ee02169d9e9b7328ab9
font_01_sfnt_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 10752 bytes
SHA-256: 487bb325ad626a189359a714f056fc3517f1d774027b6012f70971f6c6503d16
font_02_sfnt_off000113c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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