Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7997558dd53fb3…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 02:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3574fe5d4927b19eb22a6cba41e7b807 SHA-1: 83be5c53a24e46114553452f100e9033712dfced SHA-256: 4c7997558dd53fb3346c6440a8eb740bbc0ce16b49dbac086cecf2e4ed17a099
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bikidi.com/UpFiles/WebEditorFiles/file/tatutetewavex.pdf In PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/343sn1t07h8q447o9lp8r1r7lq/14981279175.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/89016184182.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b494561c9---belumadafexolodema.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa900f2c0eb---lunuvugela.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/27946322179.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/5c72400551a9ed70cda9c93ec2f9ec38/66146837035.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/tosabebigexaj.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/bejijuweboriwagu.pdfIn PDF document text
    • http://www.heksan.com.pl/file/gakipixux.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2315d43c---95515556650.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/misaduperorujabaguvu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/7irq5scfd6g5ii09mp40cjtrt5/72374620581.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/0ov7ne12rg5rhtj338dokcfir1/18357123004.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/navemituganizazubogi.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/bd1d5795de272d74597315f57229c827/tosulibonekarobexelawib.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/najobiton.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a2969c8f6f8f78fdcce99eafc4bc6198/vapixuwapupozobepekowemuz.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/52166695481.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/37243574656.pdfIn PDF document text
    • https://unosms.us/userfiles/file/zomowuloredumur.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/aqkbpp68a29ai53grachghofu1/11876839406.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608848a16895b---94561044137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=federal+appellate+courtsPDF 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_off0000c732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC732 10388 bytes
SHA-256: af21d74a742b86ac4997a34988bc6fe09396afc85db21e7f6437bac3683e3e9c
font_01_sfnt_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 16032 bytes
SHA-256: 5bf62fea0e9358acf31c68ee9a65e34aa2c4182cbaf15906b228b8ce09fc9f18
font_02_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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