Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c5bf312701a4a0…

MALICIOUS

PDF

74.7 KB Created: 2021-06-28 11:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c74ee860d70be632faa4d5e7f4a97c1 SHA-1: 10833fd81bd5505306f9ae7862635d10cf562455 SHA-256: 26c5bf312701a4a0e4907e75a73583ec00f78ad38c34b838d97c74cc71046a2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress installations acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072d967b5f67---29160040090.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ac9435a874289ea1ebd7b8069fda7b48/4624019377.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aeba171a100---xuturenofemowezogok.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/51i65cpgs1ehe1gblpae7qqse6/kuliberejigamopuz.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9fb4a72a---14675639338.pdf
    • https://vegas-shop.net/uploads/files/76563150953.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e83dab65---82943950656.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944a538f104---vararolejedarur.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070eb5884921---katarokevatunazoz.pdf
    • https://belloverde.net/emailer/file/80837617483.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/t5carjtgp7escviv8o6a9b0v4c/96747062714.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/229319e36067a1643063689c9c91c9e1/41228550618.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0cf0e196a1d1575dbaff0c2ef234c5fd/79980162817.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beefc193a68---49614134047.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/budaxunevewujeduxevizi.pdf
    • http://kbchina.de/upload/68620380815.pdf
    • https://autoparkalbanese.it/file/9864078168.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t4kkk29enojrtup2fo53o3o3u0/75424859631.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14ddb6812---38430717198.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a429732d894---74774569571.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774c4b171bc---zofazijiluzemikog.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/3e8d0de49c2d8ff2f2ed7de73975f1b7/sodurifemu.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da472c8619---femugumejon.pdf
    • https://nbtele.com/en/cache/fck_files/file/lezari.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+put+4+pdf+pages+on+one
    • 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_off0000c1cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CF 16792 bytes
font_01_sfnt_off0000d9e1.bin
db906a79341583bab268f9da4afd4536c6c049ea470d7805facbadbbcbf83ef9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 16832 bytes
font_02_sfnt_off0001051e.bin
8cfbe2c3d199b8f474602396937df081df8ae24945818b90ed6e4ba780f106f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 10692 bytes