Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c46f3b52f606dd…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 12:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6565e030f18882fae61f63a364ec3701 SHA-1: bb7fccec1c52ca97f98a3055525f1bc6e4f7dcea SHA-256: f9c46f3b52f606dd396066c68dbb1cec55f2a5ae09de19d93d8e923c33386985
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and points to compromised WordPress upload storage, indicating it's designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=how+long+will+uncooked+chicken+last+in+the+fridge PDF link annotation
    • http://lynxauto.ru/userfiles/file/27558838757.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/kinosedese.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/72def06ed68bdf11f3be19510b1abc63/ludedetine.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/wosororiwidazox.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/tutibutomijobixar.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/vafiv.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/kakigixafulisiduzitiv.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/gulexizaw.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447cc2e6d7f---tobonuwukadezeraboxuko.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/56797456785.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/90461699158.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/1811413471.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/wipusalotuf.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/32648848390.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/xabowe.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/80935316819.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c051aef24779ec76cf6ebdb5549255f3/81402440539.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/zokozov.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/48719627695.pdfIn PDF document text
    • https://magatek.com/documents/file/jilefoligobagawa.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/sisobilavunorelavar.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/vefabapugadokowosuderes.pdfIn PDF document text
    • http://dongphat.net/upload/files/gajejebukitudolilibet.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1d8b2ff5---wevexusotiboseduj.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/33366648612.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/92401448268.pdfIn PDF document text
    • 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_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 17328 bytes
SHA-256: 75237bf83be1b93c89067158df53c2a4b2601d5e512702f1e5fea20308f72d37
font_01_sfnt_off00010aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAE 11024 bytes
SHA-256: ed99eb4d85ce9da59ba7f42e13022790833d360ec202a6f723717c820aae318c
font_02_sfnt_off0001241b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.