Malicious PDF — malware analysis report

Static analysis result for SHA-256 246b113c8ec1ced2…

MALICIOUS

PDF

86.0 KB Created: 2021-08-15 17:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1097e3d123413fbf6a21ecaaf899b976 SHA-1: 8c979803c45951ce8c9ac969691c38dd4088bd61 SHA-256: 246b113c8ec1ced274d1d56ae7d7a5182b9f53ce70bc2add992f9f82d787e93d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9ea06e8117e286914a516e23a21c0435/wojadoxasexowobewobixu.pdf In PDF document text
    • http://kapsalonindex.nl/images/uploads/12730938964.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/28528594806.pdfIn PDF document text
    • http://rts-3.ru/upload/files/wanovojizosofonobal.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/1860536940.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160789aa5de431---40021707908.pdfIn PDF document text
    • http://strandedtattoo.com/file/zododabuweserojekipuja.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/73917415076.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/pixabuga.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/9b9fa94ad82976b34e4e9b302af2675d/vamanibadojaxigef.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/fozag.pdfIn PDF document text
    • http://veitali.com/upload/files/34215066811.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b421ca397a1---66906896193.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aeacb97e933---fisuvixaxojanipexosixarip.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/mizadatatenufibuzumaj.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/icnp319i5vtfo8fkpjkura1q4c/64469689947.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089a54fbb961---90546494458.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/zinilojitobij.pdfIn PDF document text
    • https://blugarden.eu/file/30374498857.pdfIn PDF document text
    • http://goref.ru/files/file/60803316076.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/i7qehtdvadqnm4ain1ur54jio2/20274476171.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/a12dea052f43c89dc2944daacd091d9b/zevaroner.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/17883938461.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/fawuduri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mi+cuerpo+hace+musica+cancion+infantil+letraPDF 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_off0000e81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 10840 bytes
SHA-256: 4e73d5619e0e806da87424d2371990e3041c819599ae940cf6a39f156bc6968b
font_01_sfnt_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 18656 bytes
SHA-256: 32a4bcd9c1ff04a132b2b67ee83da62bed623ccea393ea60bd75c6868063f551
font_02_sfnt_off00012fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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