Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae4299c3af8655f…

MALICIOUS

PDF

72.6 KB Created: 2021-05-24 00:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1e53d5835b3e134fd23ea47e7955bb13 SHA-1: 5b92413d502717e7016780c38cb22bde2e815669 SHA-256: 3ae4299c3af8655f0d67aa7c0aad1867b31c1a615b98b523609c449b2bddcdfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The document body, though heavily obfuscated, suggests a lure related to valuable items, likely intended to trick users into clicking malicious links. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a link farm strategy, common in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/uplcv?utm_term=what+1990+pro+set+football+cards+are+worth+money PDF link annotation
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075aee9f051e---vilibeba.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096c60145f11---gowepapibotomekujax.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8b2a2bdc31c6952f27932a3436cbd131/48123395836.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aae0676ce5---wugipumaginuwawage.pdfIn PDF document text
    • http://wamer.org/userfiles/file/sofadus.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4db67d9a2---97529114570.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079862c2d3b1---30668935223.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/28828498954.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/377a35fde9e7214e90ff551ca37cfe18/wosow.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/f6821hrt02bj6pttit5hjmht41/viwusaw.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d331407e5---25445684890.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/lf5oqporbetidj15uof1dgg412/95555899935.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c618a636---2645690485.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814f471ef7c---zemuwalivasarejize.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/601edf32a38388581cc4da1fe23b14d6/goxufi.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607970be4d033---tixilipujoju.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/5dd3fc5590828b2153cb249d56794a1c/66962399343.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 6092 bytes
SHA-256: 096e909bcbdf6fc326d2fa15b97ff8e4f99d6f1f0937953e5196c8ab2f1eb39a
font_01_sfnt_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 10160 bytes
SHA-256: cb48b98e5e3efd5c6abfdcaedf91d49ffcbc3c05d82f36eada18bbf2dbbef7bc

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