Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac259eca3835ef77…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 08:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 041088f3c3a9d4d901834f51ca1baa11 SHA-1: 7e3f303d09758de4945cf69b5ab4034b23ae96af SHA-256: ac259eca3835ef7776c13f2f048e523753d7a44abf36a4daad4e9080622bafed
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160760231c7ad1---rofeb.pdf In PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/979mmsjpkm2m92dg04ui95igmp/27193668416.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b7e626ec8d41878334b3011d5bce6a12/30922983848.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/b8c7emnmrm7leiics2uq7r58f1/gutidamomevonim.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/bogozalekiduzibatutekir.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/bavujupidope.pdfIn PDF document text
    • http://megalaserasia.com/upload///52845753719.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/80219367870.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/69212457875.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/igsca7ihj1t66a3b4hehks7v4e/25429564336.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/7710594663.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/foxuzeluwofapizogoton.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6150e2e5432ce9c79551f81c5f18eae5/samapubilaronekuwamafu.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/62683962162.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/sejedekidifamutoki.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e2f93fc0f---semovibekuliwedinut.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/gizigewur.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/be4ea514e1be1c1aaaf11505ed9b9a3d/fuzedelumav.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/82afca1930e08c5362c5eb3c0729cf69/zomodelu.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd26dabe1a2ad137da3eb2c279f136f9/96712839098.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/631210e14f36d7651e88ae880cc6dbed/repoxikururisaxutademit.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/bb97a9b1ef127d5c09e684e24f0937bc/24455365638.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/gubazanivulerufo.pdfIn PDF document text
    • http://mlight.cz/archiv/file/pekurevetarubibiligum.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/76340093718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cambridge+primary+english+activity+book+stage+4+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CC 16000 bytes
SHA-256: 32c9c160084183f27f45e8f965185b356245d823cb652350a8ab69b4497b851f
font_01_sfnt_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 11672 bytes
SHA-256: 16070bde9dcf8f78007eba2ce25f484376073ae350b08edcc5f422e1b00a36a9
font_02_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1