Malicious PDF — malware analysis report

Static analysis result for SHA-256 98aa0cc8fafaca13…

MALICIOUS

PDF

86.0 KB Created: 2021-07-17 07:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e2c0465af4ca29b49d2e296529be1f2 SHA-1: 252ebe3fb32a498f478141d2deba03c5f6297bba SHA-256: 98aa0cc8fafaca13e53f02dd70147c7ba6e19ab66be68b4efccad97096b6b039
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/beded37b94b4b95942a34ed1c7f5fc27/feravaroj.pdf
    • http://rhondachem.com/d/files/10665956049.pdf
    • https://luminex.pl/upload/file/navafulezoworugate.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7cf0450f58---xejumebupimasasusa.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076d602d5473---52732427535.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ht41ip919tt2vfbb9gob9lmgc4/86755863268.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094366c02e51---mafubavasu.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pqg2i3ulqtggrgf0fjq3a5r6d4/98035792250.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f23f5dac7dc---78359099596.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a426a0cd3cd---juragezeminisamumawibod.pdf
    • http://brenna-ski.pl/userfiles/file/tuzadugolunopelas.pdf
    • http://nhadephoanhao.vn/upload/ckupload/files/nidulu.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9f058b08cc4f7554c124b132e2a67c36/55142742384.pdf
    • https://htlexpress.com/ckfinder/userfiles/files/musabokiwunune.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7677dc84f---96277244570.pdf
    • http://myredm.ru/uploads/file/3713442731.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4d7fc36f1c614e3df9969361fb0da042/zipiv.pdf
    • http://centroolosprato.it/userfiles/files/denijoliva.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ga1kbs3hjulo17rse6l7eok6id/guwupuniz.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074bc618f55b---bodixuxibubakedebasawagev.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/konomu.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/s970s7tb1l3ds911d8s0jrod22/nesovotu.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/qf083079k5s74tan1v41q84orf/wuzunovomixogiduve.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b9f8d6dcd---guzeroxexum.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/15074522317.pdf
    • http://rencontres-icare.org/userfiles/file/muforumeja.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dcuo+affinity+mods
    • 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_off0000ee3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 16792 bytes
font_01_sfnt_off0001064f.bin
db07db107e83225f83c875a0528ba32ffeb83189591e4713e523accfd11d697c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 17120 bytes
font_02_sfnt_off000132f2.bin
72642b042404fa5319b8239879b9addb3591d1ed6782793a41bac654580313da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 10572 bytes

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