Malicious PDF — malware analysis report

Static analysis result for SHA-256 d921c949313f4299…

MALICIOUS

PDF

93.3 KB Created: 2021-07-04 06:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2261c61d5f55d01f02c2d6a95c5d5159 SHA-1: ed9b2bba5972dd5bf52f4bcf00545cf2b4e734cb SHA-256: d921c949313f4299ffe1a6d625bc89582e4608b993e50a9af392345f9777b3b7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to potentially compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/g7534osa0pb4928uiqrhqrrlp0/9541165113.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/44b8d900dfc574dc93541d08fcf12c97/tokijo.pdf
    • http://www.celso.org/download/99802020511.pdf
    • http://abaj.cz/UserFiles/File/75288626220.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/hnuu853fgfd5laje31gh161d1t/dovevebi.pdf
    • https://synersys.fr/contenu/file/kiwogolewewurakutok.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094d67ed5188---wubevexofe.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/35723188669.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/efea11236a56c93a85857b48c6012512/noxinog.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/40459133386.pdf
    • https://arichaindia.com/userfiles/file/punudebadewakipibuf.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc4897d09---nazapudeselag.pdf
    • http://digifast.cz/userfiles/bufawifokajomanofudivatob.pdf
    • https://pharma-tools.eu/galeria/file/vodilifakonamapujudega.pdf
    • http://mobydick-band.de/fckdata/file/13618395935.pdf
    • http://ahcxdq.com/uploads/file/011702054033.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/53634758012.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/vjjmp0sptk4cm16fapoghlksj7/vumivakijarerip.pdf
    • http://mnwebdesign.dk/userfiles/file/zurutewanajofov.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2ebce86de5e175b7a7e490ce9be0717d/bidalexen.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db56653c5a---fikegezoj.pdf
    • https://perfecthospitals.org/FCKeditor/file/5635410594.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=largest+producer+of+wool+in+the+world
    • 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_off000106c7.bin
d70a32a1da3d5e93609b654caab1b1e3763a545e21f5395be63d236e35ff2d5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 18688 bytes
font_01_sfnt_off00013671.bin
1d2413c95fecde5c03022d23499aa999247fc4caa8a158b10e8d81d23ea52c28
pdf-font-stream PDF embedded font (sfnt) at offset 0x13671 11044 bytes
font_02_sfnt_off00014fe7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE7 16792 bytes