Malicious PDF — malware analysis report

Static analysis result for SHA-256 146e0bb225496d69…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 07:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59fc68672dbe78df4c282992c0fefe48 SHA-1: 3d2ac1d9f301f641b3eff7a87c7e76f1983ae6c9 SHA-256: 146e0bb225496d690ea29aceb869f9bc42411911814c3260a2cd8b7f3114b3fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, 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 distributing further malware. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=getting+over+it+game+download+apk
    • http://stringquartet.biz/web/images/fck/file/68516952926.pdf
    • http://denprokhorov.ru/images/file/vasep.pdf
    • https://bloomeng.com/uploads/famusesir.pdf
    • https://bccphil.paramedix.biz/uploadfiles/file/46907302683.pdf
    • https://mosallaesf.ir/uploads/ck/files/goloxejilidadinipe.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ab0c28749592deaf8b1a6a197e60aa71/rinaribodew.pdf
    • http://mindatpeace.us/uploads/files/86225799283.pdf
    • https://ispartaorganizasyon.com/ckfinder/upload/files/21432539577.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141d7f948c03---sipurelixuxidonanobel.pdf
    • https://serrechevalier-skifun.com/imagesfile/29875617794.pdf
    • https://efckrakow.pl/userfiles/file/94825072177.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5ab11a1f34d7bd8b801fbda0c1e997da/9429078559.pdf
    • http://harnettcountyhba.com/userfiles/file/4532162508.pdf
    • http://robalton.es/Albums/images/file///16124850019.pdf
    • http://www.gc-antey.ru/ckfinder/userfiles/files/zilidokije.pdf
    • http://murzilka.biz/images/uploads/file/42475513683.pdf
    • http://newtarrytowndeli.com/uploads/files/35592555931.pdf
    • http://www.pratikchoudhury.com/fckimages/file/zozetarukomonigef.pdf
    • http://phoiinnhiet.com/images/uploads/files/67658114840.pdf
    • https://alansglobalservices.com/ckfinder/userfiles/files/21669050966.pdf
    • http://salwex.hu/file/32591349660.pdf
    • http://udokutscher.de/gfx/userfiles/files/9982358614.pdf
    • http://na-bytecek.cz/UserFiles/File/fudufofisinavaguxen.pdf
    • https://bike-accessories.supersites.gr/content/ckfinder/files/22342635032.pdf
    • http://usaoxin.com/userfiles/2021-9/file/worexepefopab.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_off0000dace.bin
0eb3fdd7c142cc4218c650598c0c457b57b782e1b4d5b84390ab82c20612c46e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 18272 bytes
font_01_sfnt_off00010984.bin
fd7dd6839b5b739d378bff2e4a5d404531d52239b7601ed86290ea0613a440ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 10852 bytes
font_02_sfnt_off0001226c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1226C 16792 bytes