Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da29585e6a046e4…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 10:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 913fc815d67bd50da89c2531d9a62ff2 SHA-1: f32dfa3510c722bc06fd81efa902a64baeafd092 SHA-256: 9da29585e6a046e42c0ab499674992846d76a8b5e745d0ec01c52f173f0d0f2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which point to potentially compromised domains or are structured as link farms. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://betheaskssd.com/flash/betheaskssd.com/file/11054836349.pdf
    • https://abyway.lv/images/ck_images/files/lajirukuxoxekepuvig.pdf
    • http://anquocrealty.com/uploads/image/files/filijakaxifiwug.pdf
    • http://cameranichietsu.com/luutru/files/59157948787.pdf
    • http://kietminhrivet.com/upload/files/57669443090.pdf
    • http://oralrem.kz/ckfinder/userfiles/files/wowosibiranejixorotawozo.pdf
    • http://obras.ru/sites/default/files/uploads/punewig.pdf
    • http://ahchala.com/img/file/molafo.pdf
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/xufimijawabux.pdf
    • http://tech-sub.com/userfiles/file/91289959084.pdf
    • http://livelyway.com/ckfinder/userfiles/files/komugaw.pdf
    • http://pogologistics.com/ckfinder/userfiles/files/tusarotumij.pdf
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/bad8ff4913d6ab860e4e8559841e4a40/fivopebejem.pdf
    • https://ketdoanbus.com/webroot/img/files/67161905854.pdf
    • https://zaragozadenoche.es/upload/files/gawetelivemunoditotoweg.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a3540a4d5e1---70096258179.pdf
    • http://novafish.it/userfiles/files/67068106554.pdf
    • http://livestocktool.com/d/files/8583126005.pdf
    • http://hagelkonzept.de/userfiles/file/dovemebuwimepadeb.pdf
    • http://nineslash.com/user_file/file/31727843843.pdf
    • http://maynenkhiinverter.com/media/ftp/file/62337775032.pdf
    • http://goref.ru/files/file/felofagemuzijus.pdf
    • http://geobigoni.it/userfiles/files/89760508611.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d37c5373921---zujuramaboxubimujivim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=analytical+reasoning+class+9+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_off0000bcc4.bin
f15ca4e94398cf356d4127c91fd02dc4e7ad8e75a578702e95117fb1d07dce0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC4 11056 bytes
font_01_sfnt_off0000d684.bin
f97294eea557e85dadd2c31b1fd93be1feaa8f02b0a7f09232e980e5f0de6a0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 16312 bytes
font_02_sfnt_off0000fff6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 16792 bytes