Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1d325c9441a752…

MALICIOUS

PDF

85.6 KB Created: 2021-07-04 12:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19a232e039332738c8fd4e06d51be073 SHA-1: b2c8bb0a1867c1371a4138276881d476da29ac29 SHA-256: 2d1d325c9441a752f00662129de875c0ac6484f67e787eb72cd35850cc9a8054
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the presence of a link farm is sufficient evidence of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=daily+puzzle+answers+4+pics+1+word
    • http://akkoryazilim.com/userfiles/file/wilebevinowaloruzanezet.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/a904a80aae5bc4743049ef3655b5023b/7463171051.pdf
    • http://ahxxzx.com/userfiles/202106/file/bikad.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ae5usv73ecil8ekb7udh90tvak/83878024797.pdf
    • http://yjsyrj.com/userfiles/file/63970844563.pdf
    • http://x-site.by/upload/editor/files/34905578847.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ff40j1s6e4q48caeqgq05dt3un/4197864159.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/26214c5bdb8810f0872f18338fef51fe/46355607393.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/thqom52cn5oi2bsji0rlioi9ld/sigufiduvosunoxusu.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1c4888d309b7e54ee30043c158b6e811/dalosetamafutow.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b07194b5e---8424961279.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f3f67275c---nupuwijibogezonide.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160afc28e8531e---22784595089.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3fd5df158---10005541870.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2918b2076---48123133811.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d31b1006459---feretog.pdf
    • http://ttlh.vn/storage/ckfinder/files/mabeni.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd5797c11b---dafisikixaxituzoluseno.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/cd14653734df84a8489571e0c5d67513/diwelefofikibuludamapumi.pdf
    • http://icsbc.ru/fuploader//file/10519066637.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/04b0d031e379054e2b2e9121a30ce7c1/18665723389.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/33637c969493a14f7204407cb145df0a/tedatovekefakimadimoveti.pdf
    • http://elite-nails.pl/Upload/file/2846816845.pdf
    • http://fgosvo.ru/files/files/majuvipamuvewefef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab9.bin
32ac9f78965dcb5628d7e51e2bf44dc9baa558d635bf6e9ee5fcd6e1aaae1a8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 17276 bytes
font_01_sfnt_off00011797.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11797 16792 bytes
font_02_sfnt_off00012fae.bin
35e47be28ac3dfe18f77b89e5dd5cf2546d12cdbf0cf2a26f9a6129128057798
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAE 10900 bytes