Malicious PDF — malware analysis report

Static analysis result for SHA-256 98487b11b065e8c4…

MALICIOUS

PDF

80.7 KB Created: 2021-05-29 14:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 007c22393b26037cf5762d5d90785ec8 SHA-1: 77463a0dc7f28f3b7041c4f1ff37082010ab06ff SHA-256: 98487b11b065e8c4cfdc61e131d789e70f84099e5d28413165892582fc1f4626
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking links, potentially leading to a malicious download or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://capecoralliving.com/media/file/sibirogaba.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b41da0ba---31973887657.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160962bd846c14---vorekikatipi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d96a7a0d---42381514702.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa247e0e0f---woviguxubalubusesa.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/634a0893cea32fc4c45e7ef00841ffdb/waxigutulajewusi.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607179aea652e---18026180179.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/1a282ee020a93584eead886bb94b0cf1/29107573030.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/03fc35d450ed95e2873921909c1683d2/wizitifinowusibadelodux.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/cbe58ff3fcbf940fe8b5ccbac9a6b823/siviwerivuzuliliwafoledu.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160700a910f2e4---rimude.pdf
    • http://driver-jazda.pl/upload/file/17989583692.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=imogene+king+theory+of+goal+attainment+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001002f.bin
aaac736f6844471be5e256d4d78b1cf661bfddc176faf83e859d5d9e65bd5f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 5380 bytes
font_01_sfnt_off00011260.bin
656fedb00a48bda7520c31680819f64f08167b99df2f94ba2965b09f4ffefbf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 10592 bytes

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