Malicious PDF — malware analysis report

Static analysis result for SHA-256 29bd83f59cc3dc9b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 13:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32e6a0d1d7ba18aa7090a5be7b981be3 SHA-1: aca1667536518c35f8e99fe75e74c6062303a895 SHA-256: 29bd83f59cc3dc9bffd8ca200e2a624e62a4845c0be2ef5a88542edb47b4ea10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=it+happened+one+night+watch+online
    • http://cocoal.com/uploads/file/pigodowejis.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/i77h3aa0n6bi491eqa1gr0dctd/96165625815.pdf
    • http://georgewongdesign.com/gwd/upload/files/tutudolukelefojefa.pdf
    • https://distriparkbotlek.nl/userfiles/files/56655067057.pdf
    • https://southwestlooms.com/admin/userfiles/files/serunodotos.pdf
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/72422525403.pdf
    • http://sm300159.agchost.com/userfiles/files/sogasaxu.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/122db2bcfc1d1f999e49aae6c5fbfd75/fifelibibirir.pdf
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35178407090.pdf
    • http://antasboru.com/guvennet/resimlerfiles/26900311360.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/soxepizapuxasixalajewe.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2e967662---daweletibekaxupa.pdf
    • https://discovery99.com/userfiles/file/63531851173.pdf
    • http://1-champagne.com/blog_images/blog_/file/fobel.pdf
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/35421534579.pdf
    • http://qdjshg.com/files/file/18333565987.pdf
    • http://lehnerkom.de/images/uploaded/file/memuwoj.pdf
    • http://elcivan.com/admin/UserFiles/file/ludabufiluwigosudub.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bn88at8r48nd42tbrhns6nfcd3/53422724699.pdf
    • https://alternativecarrepair.nl/userfiles/file/62245815471.pdf
    • http://evolutionchonburi.com/userfiles/files/rajiw.pdf
    • https://rpaxis.net/userfiles/file/26507044404.pdf
    • http://heydarbaba.org/resimler/files/4918687005.pdf
    • http://kammed.com/userfiles/file/xivutijekefika.pdf
    • http://dptour.net/bot/ckfinder/uf/files/64584649637.pdf
    • https://dawnraytech.985.tw/data/file/userfiles/files/potor.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_off0000dd4c.bin
6e6cd71bb2b15c28c1aa5b3ccd9c3213fbfa6f9b9b7e7acee1033c732a6b06fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 18036 bytes
font_01_sfnt_off00010bd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 16792 bytes
font_02_sfnt_off000123ef.bin
f0676a071455bf93d4b26222b4e0cf36b8571bd947fd39b4149970f09d140447
pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 10564 bytes