Malicious PDF — malware analysis report

Static analysis result for SHA-256 7822e91b23da1db5…

MALICIOUS

PDF

74.8 KB Created: 2021-07-01 22:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d15e4ce6ce28df08518598d614c5e1f SHA-1: 8fe237ef4888bfa954e73e957d61b2ee504063a6 SHA-256: 7822e91b23da1db56c6b4527b38ae80158434d66ca420d06c485bd2acc05044c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into phishing scams or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=impact+of+external+auditing+on+organizational+performance+pdf PDF link annotation
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/85nfmiar0h1acuiiu9kghtbug4/78366629546.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/60107462506.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/0f031a11a350a9b1a06f7b3868bd3cfb/58654323470.pdfIn PDF document text
    • http://guowangcable.com/d/files/9968541889.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/533ad08266ef5159da7fba8362882101/92046947562.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/87vtltasnn7d0ef47j2g9h0vk1/80449163125.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/19gngeb8m0uue39hobtj7om25k/zejotasedesanip.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/nirusaguvejixuzixuxozagud.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160adcd15f0750---79049716199.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160966970127e7---mufifemevoj.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/jobavivoxejiwin.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087784a3a921---fiwikevegitorodofulax.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/69c974a261ec485d2372a5ba6f91c378/90251494132.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f6599f280---64856085937.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/ripexilivupumus.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/7u0q2ct475kvtf0ohpmuf0f9fq/vurije.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/sevozegilegetedowojulido.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/5rr7irnc4oobe0o3d4eqlmgr6c/63099766577.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/afb1b5356bfa8fe277ba9899c2088700/sonajuxunin.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb855152d2---48521253398.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160755f4c49523---lefozotikutufazomabetixux.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5cc75b7bb---rurumamofolisi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d23c36ac1---26304186830.pdfIn PDF document text
    • 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_off0000c07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07D 11008 bytes
SHA-256: 1c1cd5509de7d16e221bc4f1b4f8a5718e7d7083cccc57e2ef1ff831e91e72ce
font_01_sfnt_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 16384 bytes
SHA-256: cb74d7a8d6a41eea77b45fa294d9e00d6ed20649390f27994764990733f7bf75

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