Malicious PDF — malware analysis report

Static analysis result for SHA-256 711002ee7d79e7e4…

MALICIOUS

PDF

92.0 KB Created: 2021-06-27 05:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4be9ebb2d7893d0b5aee87c9076d09d SHA-1: b2d16a247013ca7587f8a28cab12255e2b6cc7df SHA-256: 711002ee7d79e7e42b05db3fdf1a1efdff48cc2bfe5150326009f2e31e4d3cab
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing pages or download further malware. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/fbf6c89e49ada9643eedc8fc93da4c70/tobapope.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609100218e3ab---gubodup.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69096b8dc4---sawosob.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/099c57c9982aa7e2c172b151a011965e/62132151197.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9be044d7d58a33908ed15ca854a1135c/96820114312.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/d80pe2ht4qlp2km88p45ndcmvo/nepekuguzinetotisosupiraz.pdf
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/84673948223.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/938d54fdab2cba310b7656d2fd32fe10/ragaramisezopakajanexiv.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/1fdf7b4202d874fa5d1186e9df37ece6/9531800284.pdf
    • http://altaprecision.com/userfiles/file/bikomisiduj.pdf
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/tafubebuzoxozagujusi.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ec37fe9dc301831717734a647b2d9842/teguliwiruxim.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55a4a56071---38785549074.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e1f24618---renubadewika.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d09ae8b11---fanab.pdf
    • http://hanhthien.net/uploads/file/66153319063.pdf
    • http://zdravi-kromeriz.cz/files/file/99924456573.pdf
    • https://le27.fr/docs/file/vivexewikejed.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/qk0ccd0rp5habc645gvqm0eop1/gudironakopud.pdf
    • http://zrdb-drogbud.pl/Upload/file/46151677784.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/43a44786471df530b83bb5e3e34e68a2/41681575195.pdf
    • http://amadpich.com/userfiles/file/10752462358.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pub+quiz+questions+and+answers+uk
    • 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_off000103dd.bin
3e31a8adedc12e58994912e604d7cbefb6e4409d3d11f3d9d48c520565643470
pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 17600 bytes
font_01_sfnt_off000131ce.bin
54a0ce4d07469e6837d19ce80d0ec7d1200e6224f923ce81e37a93971af7a308
pdf-font-stream PDF embedded font (sfnt) at offset 0x131CE 10820 bytes
font_02_sfnt_off00014ad6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD6 16792 bytes