Malicious PDF — malware analysis report

Static analysis result for SHA-256 428963fa2a1c0398…

MALICIOUS

PDF

70.8 KB Created: 2021-09-07 21:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 950ab2b11af847ae73322f9165c64494 SHA-1: 07a9302d54a6ce4271dd54734f0e0a4032de5625 SHA-256: 428963fa2a1c0398aafab3ac4d5c871f2fc38146255f72d3f9e8a7435a1770a5
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The primary goal appears to be to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/d37b8ce7e684b5ecc56a8d092f90263b/nerokadozufaweleweso.pdf In PDF document text
    • http://montaze.org/democms/userfiles/file/43297472876.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/42766366524.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/bbf6e5d3e796c1dad371a88efe453e17/99482634973.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/gunupu.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/4683982021.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/80388986049.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b853c009821---2343473718.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ipp8b39kbiaica35vm46rc5tit/faxutofiwovuw.pdfIn PDF document text
    • http://linza-market.ru/upload/files/649874398.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0d8cd462e.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e2a76c86---kadug.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/novim.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/jawav.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82a048f85---71472295007.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/7nvbhb1tmnlubievk8e9mq9vg6/zorotetovizaboxexa.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/63101873107.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/gopurutaxot.pdfIn PDF document text
    • http://asfalon.com/__files/file/mufejuxevusovadirofedu.pdfIn PDF document text
    • http://stasta.com/userfiles/file/94269620467.pdfIn PDF document text
    • https://grandegroup.net/files/xafodilelodenubebiwo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7939d52f07---bedefojodusejeloliw.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/dunamif.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/xuxoxejezibevi.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gifil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=free+spirit+treadmill+manual+downloadPDF 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_off0000b4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CB 15628 bytes
SHA-256: 2f7aa36dae0fae9458aa2ff223b498666542355da4dfeacb152ccfc711431d44
font_01_sfnt_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 10716 bytes
SHA-256: 0026363afd1d4dd0ea76e3cf3f53fe2aa5ec62d62163ca00b3548fee4cf09880
font_02_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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