Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa6647eefa3b972…

MALICIOUS

PDF

87.9 KB Created: 2021-07-02 08:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a1e345fe602bbe23c1dd2891d1f463f SHA-1: 976744f47b4386369ec6afb9c90b8ab4a1e0a16f SHA-256: 1fa6647eefa3b972a47efbc31d3caa8df73bac02eabed87394f8214927abd897
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 link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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://nomylo.ru/uplcv?utm_term=how+to+introduce+myself+in+english+pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a52df0ec4---jojetekedodujetazedowar.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/068ed003a535784ac5bba84c28d79f2e/23973464827.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086873d4fd33---50791240902.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/837bb97bd0d6662f9e38fd8a4ff76e5b/texevetemamusavonu.pdf
    • http://tscyw.net/userfiles/file/20210614111031_iv8yc3.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d130b218d3---62864852676.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ba9c276e268b212358c66f9adccee118/zenubebanekakudufile.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/cqpk6m6qra79bvhh9kh9pktc80/63398355583.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/95kn2ss00smudqi64srbd3a286/xefalanusukukojido.pdf
    • http://appartenvue.net/appart/upload/images/49647498582.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ffaeb7bb---guginomaxedem.pdf
    • http://fouladsazanco.com/Upload/file/78819223154.pdf
    • https://muzeumkonstancina.pl/attachments/file/tuvedapuxiduxegiku.pdf
    • https://lienlacanien.com/img_pages/file/xorujuxonixe.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4c281716---dexesoselikibuvaruwejowu.pdf
    • https://justbuymeds.net/userfiles/file/81713474466.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609519aa89291---nemisuviniv.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8facfc2e---vorodanivaboleduworede.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/kqgsmtm0l37cnabosr5ckc4ti2/miselolow.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/8fd12051d6b0215c444584e4a917a4ab/61270500047.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6eb7ac992c7eab80a1526bf941cd53e2/katakatojenutigovefub.pdf
    • http://worthingtonpark101.com/userimages/baladurajeloz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd659366901---nepozefuwir.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608200270df2a---pimanu.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae68a8d2554---rutalelirogidoxidusun.pdf
    • 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_off0000eb90.bin
e733f68927fa79e1da9eb721133935adaf3e947cea7c2ede7abd245fc9b6caba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 11196 bytes
font_01_sfnt_off00010564.bin
4a0a4b26bd5e065561b37efa16835e3f270a9a60ce67bc711e52035d1654be84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 21136 bytes
font_02_sfnt_off000139f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139F4 16792 bytes

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