Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7cfa5319324870…

MALICIOUS

PDF

88.4 KB Created: 2021-08-12 04:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa4e923664a272697a3b1de9cf6e05ba SHA-1: 617abe38f4bf67963cf74d03ba8c02ebc9b20258 SHA-256: 5f7cfa53193248700b17a6d967b87ee7a2581d26ea341a3316095f9e14142437
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. Embedded JavaScript was also detected, which could be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/h7hdf5nbjb95g520vc03ria3re/gikivefivulaz.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f608eed3e64---69943090903.pdf
    • http://aeronautike.com/userfiles/file/14508710971.pdf
    • http://home-delighted.com/user_img/files/2299405790.pdf
    • https://jungleflightchiangmai.com/Uploads/files/zuxepizakubemibofe.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8fa9a39a4a622c8645f442236e1909d9/77195512278.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d736d8fbd---kovadeseviguxipewininag.pdf
    • http://coming-c.com/userfiles/file/mezufabiwixizuvuxaribet.pdf
    • https://empezo.xyz/js/ckfinder/userfiles/files/78553832514.pdf
    • http://neurooperations.com/ckfinder/userfiles/files/64392997275.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160deeda0224e4---95790686092.pdf
    • https://ancoraeducacion.com/images/93259609753.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104290520231065.pdf
    • http://oticonshop.com/ckfinder/userfiles/files/77136539929.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h1r2vk56i9s1agbqs3hodbui81/5483227249.pdf
    • http://skonasystems.com/userfiles/file/doxume.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/a6e9c7d81a0be530b0d815dcbb5baa13/jokekuka.pdf
    • https://atvatextile.com/upload/ckfinder/files/lirujaxa.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0e7c380c42cd6e4a76589a9c68d859ea/kajuvejufegixidele.pdf
    • http://thedewakohchang.com/image/upload/File/8471012174.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c6ee7baf481489ef8120f3ca451d82f4/57883551623.pdf
    • http://faisaltowel.com/survey/userfiles/files/kobixabikumunidit.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/79326859688.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9b07824b---kawukugaxami.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c139806436c---nirekexexozofesozubezofi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ora%C3%A7%C3%A3o+subordinada+adverbial+reduzida+quest%C3%B5es
    • 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_off0000f0cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 16792 bytes
font_01_sfnt_off000108e4.bin
067514db44c3670b416137a749fd8066533d3202d2806e5e135f19081673906c
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 11464 bytes
font_02_sfnt_off00012304.bin
b68160745464aa77483e5609eaf4bf05ac401350eba23d20c314705ada832691
pdf-font-stream PDF embedded font (sfnt) at offset 0x12304 18392 bytes