Malicious PDF — malware analysis report

Static analysis result for SHA-256 315a62424735794d…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 22:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afbdccb00989238d9c6bb561aedcb19f SHA-1: e850edb6e0aa08ce3bc5f42266a4a68d96998b93 SHA-256: 315a62424735794d5ea460624352a7dc25c05e71f3578268b882c85b2f83c438
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the heuristic findings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/141d35f9b731b1e0a2caee7da3df178d/91283043895.pdf
    • http://geostudio.eu/userfiles/files/81850259624.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078314624882---nesuzorazoxe.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b07a62214fd---42176825052.pdf
    • http://sochistandart.com/ckfinder/userfiles/files/41160162128.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f441707ac3---gomumivasubuta.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f836cb735b---kejesukel.pdf
    • http://bvsaigonbinhduong.vn/uploads/files/87215779862.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/4a36bfd2e3fd28eb443c535898b5d166/dafukubokitewojazupebux.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/7s9d61t2rud1erpvvpe90iuc5q/pulisaxan.pdf
    • http://patroha.hu/file/80280701858.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16089329ec5162---jazol.pdf
    • https://angelsstaff.com/uploads/file/sinojidamonogojixewuzow.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeb3ba1b7e---332138808.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8a4342ff9---nirixupufovifunonusaxixo.pdf
    • http://hurtglass.pl/upload/file/girofuxadowewowim.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5982d833da---41766394506.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a8a415d51---25226823353.pdf
    • http://amghanoi.com/images/ckeditor/files/pomibenowavelonin.pdf
    • http://akcjonariusz.com/UserFiles/file/55265143217.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a856ed23b9b---varubugasolapokajirekoba.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d193e1b3b---13002957232.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ce69fb0e---98987087891.pdf
    • http://www.pattyn360.com/upload/forum/files/libesabiwelilokadi.pdf
    • http://advicetao.eu/pictures/file/latidixokerotelix.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607585fa58251---watidefido.pdf
    • https://aduanaldelvalle.com/userfiles/file/bewuwituzizomesoxi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=schistosomiasis+is+an+example+of
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f941.bin
091f3881e5f5bc242a7be76f1872b2d8daeefe4a7e932f27e3f0159b8abfd33f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 16264 bytes
font_01_sfnt_off00012350.bin
12ca206f1965feace637759260b0eaeda036edf23ec7008d2464202ce0b3f8b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 10820 bytes
font_02_sfnt_off00013c18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C18 16792 bytes

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