Malicious PDF — malware analysis report

Static analysis result for SHA-256 74043f94156a0588…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 23:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9327e15d46e79a708cafa3085874896 SHA-1: dd677196a18a4ec5420890966738fa95ead4993e SHA-256: 74043f94156a058820ce0493b04838ba3287a796ed8ba7a46fcf3c70b0e2e9a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://gorisum.net/fckeditor/upload_file/file/92342957537.pdf In PDF document text
    • http://lsneotek.com/ckupload/files/81171054777.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/fipaxawakajovagivuwirajed.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5e3ed73f---67736209184.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/51739328582.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/votufuma.pdfIn PDF document text
    • http://maihome.hu/admin1/file/13363173469.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135bba0274f0---81511342100.pdfIn PDF document text
    • https://onlinendttraining.net/files/41493093174.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/92082647592.pdfIn PDF document text
    • http://gro-felix.si/uploads/50631951376.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/voseganexewetulib.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/luzegojukolulurozenigu.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/dodobukekirukilejazivupu.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/d31df6fe33fe0a659b75c29690791cfa/20228619688.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/47026253270.pdfIn PDF document text
    • http://vhz.cz/user-files/betikopobokanavaxe.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210904000730.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/36347042249.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/57038799562.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/kawibi.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/28879431569.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/kolevurisuzilid.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/82248078593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=best+quest+adventure+gamesPDF 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_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 18144 bytes
SHA-256: 4345fc3bf31a12cf6fb651754063f2bd6a98c0dc696f5c8330902d8477d53c97
font_01_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 10696 bytes
SHA-256: a4f73c1a9d9ce8ef5fa1e055ab5baf1de46977830b5bf159a8f0c8e8fc3ed354
font_02_sfnt_off00011ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1