Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4f4219d79be914…

MALICIOUS

PDF

82.8 KB Created: 2021-08-20 14:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4f553a808ebb51e37251bb1e07507c8 SHA-1: 8c23c22817e308976a0f9e1f772e3198551cc85e SHA-256: 2c4f4219d79be914557ae18bbf4a1f36da0416be45c227ce3c7ec0c491e0d53f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The PDF's structure and embedded links suggest it is part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/da6b6165320658a3722ca0762015d3a8/poxesozejapofu.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611a2c209132f---22694699913.pdfIn PDF document text
    • http://dgjst.com/upfile/file/vukixer.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/72779830579.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/tipogixuwap.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/78024847674.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/cabb46f898cf67eb8dda52091199f79b/xibukirepaponi.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/22eg4ts2dc25d000lih44f5id8/pawad.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/kawojux.pdfIn PDF document text
    • http://simonide.org/userfiles/file/fopugurugunedozagazigum.pdfIn PDF document text
    • http://fnathservices.com/upload/file/95221364770.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/fepivavoja.pdfIn PDF document text
    • https://andrejc.si/files/file/dudominudixukoto.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a748121ba03---10975603454.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611687bd963b1---8647603079.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/66877946684.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607389fdae0f4---74203235870.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bedd2ae1f---jejenedisirinejiluvimusuz.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/davidabem.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/dejeselo.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/fezufodenenedezusodez.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/40545576507.pdfIn PDF document text
    • http://web5gstore.com/Files/files/30202694539.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0b4152e9e---32177423613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+turn+off+amber+alerts+on+verizon+flip+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 16760 bytes
SHA-256: c67274a320c4884aa42629e1b0ff8ba95a34e9f1b03a3be3419f91849a116f65
font_02_sfnt_off00012325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 11064 bytes
SHA-256: c66a146abd7135f46a3561eabb6cb903247adeb080ccf51b1c967f21dd76b85c