Malicious PDF — malware analysis report

Static analysis result for SHA-256 f373e7f2ab92778a…

MALICIOUS

PDF

94.0 KB Created: 2021-06-27 00:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 276c5f0160131933b0e6bf226b065ffc SHA-1: 36c07f1e3a0462bdc8b9ec0e882f9ad7ddf90ef8 SHA-256: f373e7f2ab92778adb2479dd38b21d9d98701da23f5c87b0948b6bb17681758a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://philabc.ru/uplcv?utm_term=ranch+packet+sour+cream+dip
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ja5bl5mv29p526k6kdpqroc3lp/gumazuke.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/c5a1613eb5bacf22cefef05abce4357a/80154721127.pdf
    • http://toyotaquangninh.org/data/dulieu/files/wojesivuxuse.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b53e135c8c968b1b1a632289cd41fae1/rigugilepebilawudebab.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0366d3b6f9---kagefogogisabazi.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608565d7b692e---4541914226.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a38de684d69---33973160070.pdf
    • http://furniture83.com/upload/files/77835190079.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2dca0d6e8---xefesubugejowajogidit.pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210624_9949E281D15C2D2E.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0a1b96dcc---9114729410.pdf
    • https://digireg.nz/upload/68265777174.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7c29ba0f8---91780734455.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd70769ee---76355571855.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/c745sm358c1sd63rdn1076qao6/zufevigesod.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/317jnvic9i54c5t267uebvqc5a/vamajevaxuniluwimigu.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/13990715691f14f42da5156b285c23fc/28300338919.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4edbc5db3---tirasus.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b5d652cd5cdb424093cb3abb97c2fa59/xebofunoxuduxo.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/92437e5bae94b059a4b4ea004d13af13/mabimarojamidurewovezovam.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43cf66e535---71659459484.pdf
    • http://sunnysolutions.it/uploads/assets/file/36143636303.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/botunefisobagas.pdf
    • http://allamericannursing.com/userfiles/file/tanedokeropebajezur.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c60cba52db9---68330184410.pdf
    • http://dieta-plus.pl/userfiles/file/lebekasevagev.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f394.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 16792 bytes
font_01_sfnt_off00010ba6.bin
3e31b2e7218787ab28d8597a71472b2888e69dc2c1090faf3c1518b666ac9e0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 17988 bytes
font_02_sfnt_off00013aa8.bin
b02eecf9124a63e2f780d27ef858c25c18bf839b06451fd0d99a91de4b176a59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA8 10972 bytes
font_03_sfnt_off000153f0.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153F0 16312 bytes

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