Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0b12902c81e8ea…

MALICIOUS

PDF

99.1 KB Created: 2021-09-04 05:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f0d32009923035e8c69decdcc23fdef SHA-1: 5e0b974658a835f728e4abd53b3477311ca874b3 SHA-256: 9d0b12902c81e8eac9dbcd1e37a170b7a9f6857079d081037489a0167dfaec45
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically related to phishing and link farming. It contains numerous external URIs and links to compromised CMS uploads, suggesting an intent to redirect users to malicious content or phishing sites. The presence of many distinct hosts and UTM parameters further supports its role as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://asmitahrgroup.com/ckfinder/userfiles/files/nemujovorakirusawefodofoj.pdf In PDF document text
    • https://terrebleue.org/userfiles/file/39422165470.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/xopavesirusu.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/gogenabor.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cmnibegkkaufv2hche2t7os3b2/84411597867.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1cd0635ee---80905894830.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098559c6e7e7---730104811.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/pusifanowadudatim.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/97688837198.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/6973828737.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085487de723d---fumifakim.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/f2d5ppo7ci5man5959f04fkc93/vedifenalakuvatebarofed.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/e91592386a8d0b25be1198d2b96e5afb/32469472984.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/raguwanigevivavefo.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/litusamu.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/av3s729sms1i5l4gc3dd5b6l78/wadezijinetebigusasajurin.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/59057941487.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608200d3d84a3---vugalerasekakuluri.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3ecd6cda6---92957677414.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d3673d8402f856970bd6a96537b7d63d/vosifovatepomitopi.pdfIn PDF document text
    • http://newmob.it/userfiles/files/95438775876.pdfIn PDF document text
    • https://dafelia.com/files/78418971659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=barron%27s+gre+3500+word+list+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_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 11272 bytes
SHA-256: daa25d4e57c2d5fb432d3b992c8ed33a87c4565b9e5518767c378a9ceebd217a
font_01_sfnt_off000139bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151CF 17700 bytes
SHA-256: 6727cc69d3324182cc2de6ec9e9612ceb4e65aec8723a1180c64f33a2d93906c

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