Malicious PDF — malware analysis report

Static analysis result for SHA-256 db01cfed3f72ff7f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 10:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 644012e0e28a519d0e48907efb608fad SHA-1: c33e47ef2e1972699cd9762f55d20c1113d5eb6a SHA-256: db01cfed3f72ff7fe602fcf524f2c816d318f8bcbacb82988eacd43437527774
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary function appears to be redirecting users to potentially harmful content through a network of disposable hosting and compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pendekaremas.com/contents//files/namigepo.pdf In PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/98247539636.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/44149127482.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc41fc16cbe---62214645348.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608d436589d5f---tejasadovonuvip.pdfIn PDF document text
    • http://hnysft.com/d/files/lozajonusaxokawegepobezim.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/1905147416.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/7603267057.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/40173893843.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a851119f21---30535591739.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0be39d0d0---31429157753.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/welegosedoxiveb.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/25319974190.pdfIn PDF document text
    • https://mytopics.it/uploads/file/1749076934.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b98ab5adfd2c6c0a5414a7b1465a019e/28624052976.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123cad4ab406---80144421148.pdfIn PDF document text
    • http://dongsachhanoi.com/webroot/img/files/18899928489.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/r2pg75vtf14qs3cbgd6hevkrpu/73776196839.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/02b4dd1228fbcec3e4e5c04c30ab0442/56446321254.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/23519356086.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/25697597944.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/wipupazofugopujubawudod.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/480mrmom4ae1g4989i4aklmb9e/836579663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=largo+winch+bd+pdfPDF 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_off0000de56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 10640 bytes
SHA-256: b725152be634c74737943278286c19d7ece15da1b686a9f838dd418d88cba1da
font_01_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 20156 bytes
SHA-256: 3f7024032c584c294947da5b88a1240fe804a9a7c7a808a6324e62278f6e00d6
font_02_sfnt_off00012a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1