Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05542c80a10282d…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 03:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 14434c9713e4bc632d22a6dda87a5704 SHA-1: d85643040e3cccc888bfcd60f9dab3c388726947 SHA-256: c05542c80a10282df093b364fa3314d8ece943a5a744d0a2c72c2de8b351a7b1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133555a286a5---dizobutiruloj.pdf In PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/refubedowibako.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/18428079969.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/95871469708.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2cf3eb1b6---11144332406.pdfIn PDF document text
    • https://laps.pl/userfiles/file/97859925328.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/18285460269.pdfIn PDF document text
    • http://juha.be/_files/file/zusuwivutavowi.pdfIn PDF document text
    • http://licausi.it/userfiles/files/tonodupukevijo.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/98111986961.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/petusa.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613af4d1d2fa2---wolaxifis.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/69261942681.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c983f3c9dd4404f33896d74e3b4f7bc0/kikobebamudipuparug.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/kozogabevoga.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/fivoluturetodaluded.pdfIn PDF document text
    • https://media-get.com/userfiles/files/2809327894.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/ginavupureramuwa.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/gazonodeviwiwarid.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/pewixinajozivokikokiroji.pdfIn PDF document text
    • https://eslms.com/userfiles/file/xonemopilidimutirexup.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/zegexivuradigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ips+patcher+apkPDF 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_off0000af88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79A 15584 bytes
SHA-256: 2ca2315a95f7bbdcc02ee28bca5a7f52b222ce6b41a5d5723c2de0b20ed80cdf
font_02_sfnt_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 10152 bytes
SHA-256: 37d838d84133551c113626916627d4e5fea0dd751c8d17c09a981c2d74a92297