Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc444588a790b5b0…

MALICIOUS

PDF

87.5 KB Created: 2021-07-20 07:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37ad140fca45d81ac62621c33bcd34c2 SHA-1: 9ac81b163e60262bd1ed6e0a267ac95e8bedfbfc SHA-256: dc444588a790b5b0a94b1a5354e07af0377059d4c828613b9c04aa89534dc235
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure suggests a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/b7309214d246fc0ab715efec7f3f806a/72208813119.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8537ca3b2f79f1fabb8e3274caccf79c/33706424115.pdf
    • https://musikkursus.dk/userfiles/file/gutuwuxepajefezetutifodej.pdf
    • https://shellserva.nl/docs/Image/file/6405048089.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/32338837371.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/27025e140d6da8cb34e2cf25678b156c/94758420471.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0fd682713---37627535388.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607507186ee9a---mirunejevekuwexabaji.pdf
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/fezekewudubavud.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/34d868e0fa889cf8b6f6b867268da4f5/69275908822.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4816264ba08f562ef45437a1a7d902f8/56722801816.pdf
    • http://studiogiamberardino.it/userfiles/files/merisapobanakofawe.pdf
    • https://aawyx.com/sites/default/imageuser/file/litizorusab.pdf
    • https://liniagdanskzydowo.pl/files/94538096585.pdf
    • http://etenindex.nl/images/uploads/79125323450.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cff59b57a---detijipegamomesajug.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/fec7fac536858be1910f8b42f9d54b7d/vozonidupi.pdf
    • http://daegyung.kr/userfiles/file/20210713235009.pdf
    • http://pantryscan.com/123cars/imagefck/file/67200524642.pdf
    • http://scarpatti.com/files/72616057197.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/5e91b348b6f8f6eef8a71ab965f293ec/23943206961.pdf
    • http://vuatoyen.com/uploads/userfiles/file/biwol.pdf
    • https://jurad.eu/files/file/23272770973.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/kvmgmfbdbrdnhhh1gecea0spu4/paxakem.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bi+annually+meaning
    • 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_off0000f53f.bin
b61a94811389b48dbb853382ffaf7a69a6fd15640fec6ee7c3c422519e76d678
pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 10232 bytes
font_01_sfnt_off00010c21.bin
1a2d83a27cf8d2a41b6b6c4a508c154f4b2ad3944420da8d35623ecf158dd6a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 17228 bytes
font_02_sfnt_off000138f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138F6 16792 bytes