Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2b4d14394ceeb7…

MALICIOUS

PDF

122.8 KB Created: 2021-06-27 07:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c98b9ccfa00af88e3b3ab91e3950d21 SHA-1: c9e22d82c87d915df1b1ca638470caa269ed1587 SHA-256: cf2b4d14394ceeb723b9694373bd57b87f04c98ce43e20b07476908c35a0a1e7
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 upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/69d7bc80031754a208c2d548e05cb58d/tapobizunafal.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/da8e15c9670ded1b1ffe0931c12e7e44/13003928306.pdf
    • http://www.vegagastro.pl/upload/file/namexagon.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6d29ae23e---45541682158.pdf
    • https://alamansyria.com/userfiles/file/wuditaxotomudiramaxar.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a859989e610---mizemolugug.pdf
    • http://hysansam.com/fckeditor/userfiles/image/97496649398.pdf
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/e76522bc19ae4e30e680e97e4c90a981/67106952799.pdf
    • http://nesthomes.in/userfiles/file/wevidopel.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i5511klr0tb6508dar71ch4nb1/tozarotudowezazejul.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/63200508312.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/b0228793f4b1b39bcfb772ff4bf17b43/10232046406.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6b9sqp6oqbquc9pjtq358mm1l2/38537425653.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a1af72a037990e36424022ab9e9d5d75/zeligovije.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d0dfc73d0---60838880197.pdf
    • http://abimobiliare.pl/pliki/File/55786827111.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608316e284336---mewapeniwadizu.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/61c8df01d524677a76db89d9f3ef9b3d/77304956386.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082acb951411---nunokedutoredufizopajek.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/08ff47f77886a419813e673ebddeda23/nabow.pdf
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/9d6b20b8a747993ecb1e37e5d16aac92/tikanuxozamukova.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bacb79450e---78007234335.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/921f0d8aa16e9a49fd9078016159a167/jatodokuvunajimiregutu.pdf
    • http://russkiivopros.com/images/FCKeditor/file/94996536390.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757a911fd44---tavifi.pdf
    • http://bidmitt.com/img/files/file/65804187868.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=show+me+pictures+of+flea+bites
    • 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_off00017b0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17B0E 16792 bytes
font_01_sfnt_off00019320.bin
719c9d0d6f8c510d5f5fa27c9623bef069d25e68d1d69e81860e55bbe24ba6fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x19320 18460 bytes
font_02_sfnt_off0001c420.bin
723ffaae9aea072d3eba475b4b94e1ea7d90f5a043246ebf22cbf6be5dea582e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C420 11040 bytes