Malicious PDF — malware analysis report

Static analysis result for SHA-256 384e2936ca7979da…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 08:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8d26435b0abd1d0704d636144829b8e SHA-1: dfdee2207224c7cb8f83d467c8f23c803790e805 SHA-256: 384e2936ca7979da8be24a8d9f525f27682d0247180321e40e27d07b9f8dae12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://medvor.ru/uplcv?utm_term=intranet+definicion+pdf
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/lofafulajilirijogukolok.pdf
    • http://shiksha24.com/userfiles/files/27892113347.pdf
    • http://hainescentreasia.com/images/file/kezimuzozekup.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/55477e3c8a431566f81d1bb298e3564e/55603122932.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/30bdc3effa4b78b81af4bb86c87306cd/14639687276.pdf
    • http://xn--e42bt3l.net/upfile/files/godudigogupazijatorub.pdf
    • https://bnbtravels.com/ckfinder/userfiles/files/ramud.pdf
    • http://foodchemsino.com/d/files/jixipak.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612c48ea51e82---xakimapowuxozerun.pdf
    • https://betamachinery.sa/other_files/File/biwonubapixodokev.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e62cab15dcd53c5094cc7fdef9a4333f/11800239854.pdf
    • https://alternativecarrepair.com/userfiles/file/vowipebejeda.pdf
    • http://dahchen.tw/userfiles/file/36291968543.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad05b11a5---fikuw.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/8jc526odgvecr297c4eejthih5/ruwar.pdf
    • http://royalgroup.at/tmp/8994463481.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161356978d6c7b---4926178684.pdf
    • https://liniagdanskzydowo.pl/files/42742257331.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/h5lk7089693ie2090ag5pb260k/42412945553.pdf
    • http://ndt-tl.ru/upload/file/94595936478.pdf
    • https://brawlcall.com/ckfinder/userfiles/files/jununogegosaxusagomizu.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/fe2caa71b212d73d34f431e1844071f9/nulegosotevotikap.pdf
    • http://sungder.com/upload/lameluw.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/75cla8fmfkp9s0k80ispk4d3d3/35991927402.pdf
    • https://soechi.net/userfiles/file/wopixabuvuwugagudebir.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/l50j4i7igssvi6o9siilp7mtu7/vemibaximakafad.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_off0000dd87.bin
39d254de8b3a3abc978b524f31e78d02337f2fe704d68bf003e3dab9b851c1b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 18856 bytes
font_01_sfnt_off00010e5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 16792 bytes
font_02_sfnt_off00012671.bin
2f151a3bf425675d5bb2b0e50ccda8c35a08013a5a31436e8073f634486e2e65
pdf-font-stream PDF embedded font (sfnt) at offset 0x12671 10352 bytes