Malicious PDF — malware analysis report

Static analysis result for SHA-256 374d6cdb4b5dad21…

MALICIOUS

PDF

93.8 KB Created: 2021-07-23 14:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3cbb88583ad628ce9a8fb0e3e532476e SHA-1: 935c938d515c18a792c2385a7dc248613465f031 SHA-256: 374d6cdb4b5dad210c615a9154bfe601b9bf503cae05a160b78c8737e854ac34
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely to distribute further malware or engage in phishing. The presence of multiple PDF link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/itnc2mqvigigk76j03oqsf0l64/73142543509.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28498bf2eb---jiranavejapofesuxilava.pdfIn PDF document text
    • http://kokomo1986.com/clients/31029/File/miwiwe.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/j7pc4akek7u89v92rkaqm4m596/jexamumerexef.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/milumimokiru.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/60463291136.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/pafujezotasubafuluwad.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16094a0832183b---51085038052.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/v0ues2309cfh5aa88mto05jpaq/bunud.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4c3d5ae58de824cf035e5893063e3e85/sijojijox.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/tegonosimifilanebasoju.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd76a26d8---73950763726.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/0t9j9mme4nknspveigk6151f4v/56303664806.pdfIn PDF document text
    • http://srutimusic.org/userfiles/file/93212231285.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/c4q5en5bv0rhpdqkip7dogh4g6/30261575673.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/raneme.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/43777417160.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/49912339793.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7ced17d17---3885266090.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8309e3ab1---31838092371.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096b89f547cd---8422656734.pdfIn PDF document text
    • https://0900107678.com/upload/file/66313285581.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/dimetiguwogusezuwa.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/podekinorikizumoxed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=descargar+minecraft+launcher+team+extreme+todas+las+versionesPDF 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_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 11192 bytes
SHA-256: 69adb3a9903d836edd4b95a7fad3dde72db8d62c96cbd95bc575d629feab4ad8
font_01_sfnt_off00011c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6E 19804 bytes
SHA-256: d649a3a5be6736c74fdcad2fc231a9660dad8ae8d731c88a04fa7db810416953
font_02_sfnt_off00014f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1