Malicious PDF — malware analysis report

Static analysis result for SHA-256 3927764307939f3c…

MALICIOUS

PDF

139.7 KB Created: 2021-07-13 17:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ffeec6f4d8a7b00ec55767319f27c41 SHA-1: dacb702790248809f8d7431b72cbace1bd68df86 SHA-256: 3927764307939f3ca8874db6911414e9609a7eea74e9ee35f762e921ee0bedb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://oguzlarotomatiksanziman.com/depo/sayfaresim/file/vuzik.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e4d4d0dc9---16127025709.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f1c1b9496c1eceb94ae2f849c368d628/vejojilejako.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d32baea74---22031437896.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096884ab99a3---16267258351.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/nesixawad.pdf
    • http://arniestribu.com/campannas/file/difarotizune.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5bca6d260cc8e2d63638d2a07305af12/nekiruwiw.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2302e538a---jebikilimezezi.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/p6d08gf01hsdufmbo75241vqnr/tenopajoso.pdf
    • http://nappsa.org/userfiles/file/26898084246.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ebee35354---xajeliloruwitezabulivo.pdf
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dusewatezonanemerexal.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a111247415---72058710098.pdf
    • http://amdind.com/userfiles/file/30750225761.pdf
    • http://obrienbuilders.com/userfiles/file/70057153579.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b4788b23a665c5b4d8ecde99137cf859/wegoxitawa.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82ba5222de---siwulumibexuvuwog.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf12f50d6a8---9810244471.pdf
    • http://scheiden-maassluis.nl/uploads//file/33854049854.pdf
    • http://teusz.pl/UserFiles/file/lowujuvewa.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a689e9cc7ed---sokobu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+king+of+queens+restaurant+row
    • 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_off0001c2d3.bin
c1fa662f26864adeb0c0a36a2fef93b9bafd35615dc0d96a1f9da9738e54fde3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2D3 17396 bytes
font_01_sfnt_off0001f03c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F03C 16792 bytes
font_02_sfnt_off00020853.bin
66888b83a7665fa6eea869d6c539c9e71823ecfbdf6375c5687b598f1e0be0ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x20853 10836 bytes