Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f864f64452d6e37…

MALICIOUS

PDF

73.8 KB Created: 2021-06-26 03:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a713a0529d449ac394f78e5a4b7fa70 SHA-1: 5ad08e551fd52d4898ec4fb236451cb20ce5bca7 SHA-256: 6f864f64452d6e37911b08ab87642672d911f5980257a35bc214f7e0ecfb2d8a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting a tactic to distribute malware through seemingly legitimate but compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://say-international.eu/userfiles/file/89961937917.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/bfaa14e87deee7621b0071287e37dfcd/19903307598.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6dccbad55a3046064cccb9543b3c8bc0/viwekiweziv.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/krhn1uquuvs3knv92a74mqnoof/fevimasilodavegajinetage.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0e573c4a---rasalesajurobulajadu.pdf
    • https://fultoys.com/userfiles/46852305450.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/its2oehk2nc953d1etilr4udpr/tutagowexufi.pdf
    • http://randalljroutson.com/clients/44711/File/xebanoxonolakutegu.pdf
    • https://luyenthitoeic.info/userfiles/file/18963673490.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/79bfd2bc096614508e53e7e0afda9da0/nofojime.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/10bc27ad48b2b4395a8bf56669f6f1bc/73367853843.pdf
    • http://dorrstrechy.cz/UserFiles/File/91360509746.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e620758143---97765172285.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724cb6d14cd---48384419190.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d687a5b00b---83222263384.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890eed308ec---55620879120.pdf
    • http://atmaircenter.com/lb/userfiles/files/70054983249.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceac3b920a---59196210837.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d4587c8ee112518f044ae197f803ffdf/foliremomurowexawiketon.pdf
    • https://ski-experience-japan.com/images/blog//file/36567196659.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160892858a6474---radujesomozizixagexoginuk.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b31b2e000---takijezom.pdf
    • https://robertbah.si/files/file/65988811506.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/435bbc0f545d56340df147476db14b8c/dajogokuto.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=all+games+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf59.bin
cea1e7b6d9fa96917a4c350eb4cd2ac47a51a3f091a9c773f6596e1fc7a77547		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF59 16464 bytes
font_01_sfnt_off0000e9ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 16792 bytes
font_02_sfnt_off00010216.bin
77a6cbec231aa216d0e84b83d79860bbbe173e0e54a1253457294a5849948791		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 10604 bytes

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