Malicious PDF — malware analysis report

Static analysis result for SHA-256 958ab34edb443c74…

MALICIOUS

PDF

85.4 KB Created: 2021-06-29 19:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66e34dc90e3812f21409d7a7d463bce3 SHA-1: e968271e41cc7db25360ed8344c181c3e931904d SHA-256: 958ab34edb443c74a8cc64e268e0688e0b99780cdfb10b36be45e09e74c7ceb0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075195d48b22---44811288680.pdf
    • http://digifast.cz/userfiles/90812170344.pdf
    • http://sxhk365.com/uploads/file///36875075057.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/gatixi.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/072291ead2ce64d77e21490b77ccba91/suzip.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b2aacf8ba---xopasozozaditot.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5pse4gg8mvdhkbl30pbh6bo1l2/radawowosidu.pdf
    • http://www.logomarcanet.com/userfiles/file/82709233267.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/60hphkvb0bfaf45fe10ldgarq1/93701153156.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/78671503460.pdf
    • http://aliceinformaticasrl.com/user/pages/87551095091.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/cd2f76a857fb614560de2762711e5913/98983811591.pdf
    • http://komputerzagrosze.pl/userfiles/file/86042721487.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baad2d06b76---49327348811.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9bc4f5e3c5ae5de0cd5fff2ec68b2f4f/fatanonodekabezonesog.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/cf6d3ac518889c2ccea7736198a16bfa/68020767973.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160836e42afc36---gowixudivexetasok.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f9f77d768d3f3306f2fc130e660f5f61/vasajavom.pdf
    • http://nowyhotelik.pl/userfiles/file/46895200077.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/413386ae1a88ba030f135d1335960b9a/ganimopevopakuloveponese.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082cccc1c7d6---10641889716.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ccc40f285180c81707a81c336c74af05/vunozukelanaka.pdf
    • http://azizolace.cz/images/file/69596529587.pdf
    • http://daiichilogistics.com/uploads/news_file/20308409387.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/1edbc12d045136001050ea003429cc18/sipateridamil.pdf
    • http://uforoi.com/app/webroot/uploads/files/22559791709.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sample+of+authorization+letter+for+claiming+money+remittance
    • 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_off0000e6dd.bin
ed6dce65e4032049466a21f022ea61a0bad2d0c28af31fa45627a72596a5a394
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DD 17688 bytes
font_01_sfnt_off000115a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 16792 bytes
font_02_sfnt_off00012dbe.bin
b54d9f95d0de096b7e4cdb9e5358901472d21850ee1e17ab21f1d53e070c3b5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBE 11108 bytes