Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c3d3d3a0b688fe…

MALICIOUS

PDF

86.3 KB Created: 2021-07-15 09:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f5d51902c8b3eb063026d49a7c21d715 SHA-1: b5a2ec78ffc061cc223197d4c9972c159a4ebe0c SHA-256: c6c3d3d3a0b688fef59e3d5f306318441f1d7851b1c9a61319bbe89d60ae07fd
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. The primary purpose appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rzfmuhasebe.com/userfiles/file/vebujijaronakumuxikitukug.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ve8lnat7subc7ehj8k0gspe4u3/80786439162.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/wuwijorifox.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/tekagumepigenajene.pdfIn PDF document text
    • https://ecoretras.com/file/lelivexirapigelukatodopad.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e7641040781555800c6a9d133d30213b/21516699200.pdfIn PDF document text
    • http://22743333.com/userfiles/files/wavuvaropamedufawiniwu.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/vidagovosefatoxarixi.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8d5f37500cf5d946915710c90eafc179/zobowurizuwewax.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/13547324687.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/fc87e9f11028b8c78bf9108250b94d4a/28102459172.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/530fb123eb20bedc08c6172e90b13057/31650747628.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746a85dc431---60413617978.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a04cfd91---bovelodugowas.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/nikezurizebokux.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8lq1b5jksacbsv2jghrtcr3giq/midusoxikukamodopibolipep.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160704ac764f3d---66145121764.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/91498856748.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/17lf21tuu2ci83hinf3r0g5gm6/50235149655.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/dotitijogatiduzo.pdfIn PDF document text
    • http://www.asslar.de/downloads/xepufigamuwanasugiketub.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/zawumenasa.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/1ndslrqujf6opchkp622fk439a/73243084982.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/57678452365.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/55440185396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=straight+current+carrying+conductorPDF 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_off0000ef17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001072e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072E 10724 bytes
SHA-256: 2de43b15e8661a5ea9f4e0caddcc8828d12eb70340d298db0d68581396d96ec4
font_02_sfnt_off00011f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 17092 bytes
SHA-256: 5aa34ab6e3adf2c2569a4f44d4d81bcde68709e277ef4c697c00e434962ce9cc