Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f475c400b003f5d…

MALICIOUS

PDF

85.0 KB Created: 2021-08-13 21:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac880b74baf2e8edc24d6d041d50a0b7 SHA-1: 7a98b17587b0006d7bf9e59f9c29e6bf98c515c3 SHA-256: 2f475c400b003f5d74e5dcb8e8b14213b8260ad53ba375c940558383e031fd5f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via these links. The file's structure and URL patterns align with a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080931d5d3f6---58367050383.pdf In PDF document text
    • http://worldtile.net/jangheung/userfiles/file/16024494584.pdfIn PDF document text
    • https://roc.mn/uploads/files/mopisimunikologexufapapew.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/nijefonur.pdfIn PDF document text
    • https://andrejc.si/files/file/femitexuz.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/takazumolugigev.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/vagatu.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/41247589766.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/rusexosuxep.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/samudeledupigudaxagopor.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/97219706023.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/dofaxejeligokobi.pdfIn PDF document text
    • http://yuha.be/_files/file/15512653817.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b8245361b45---nalekezedufafetafiwexe.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/41629598810.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d03cacb46ca2dae4f3fa89206cb3d627/vuluwijarofuwo.pdfIn PDF document text
    • https://egf.tw/test2/images/file/3017701314.pdfIn PDF document text
    • http://gerocuki.hu/user/file/23403193107.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/fidogokogosixejam.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d40b8de58---giwunasopujola.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/gsh99kebanckl3tfch4g1v8fpk/50467789563.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c6dd0e48---78007478114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=chemistry+percentage+composition+and+empirical+%26+molecular+formula+worksheet+answersPDF 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_off0000e4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 11104 bytes
SHA-256: a7aa04324165e2629c4baba28c8ccb1a01ee86e90bbbb1a6ce2365fba98dd502
font_01_sfnt_off0000fe6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6E 17408 bytes
SHA-256: 09b26bc75181c65d2bc946f5d64d9ee37e769f263a52877afa7dfcc78761fb98
font_02_sfnt_off00012c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1