Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e174e75e631f0e…

MALICIOUS

PDF

125.8 KB Created: 2021-07-09 14:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4eebd689ee12824634a01be33ff23fd7 SHA-1: 705384b06c5eb72efa454ee333e859149eef4e03 SHA-256: 43e174e75e631f0eba21013ca132453b1af4b42cdb6931dfb4e5db07f608fde1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites. These links likely serve as redirects to phishing pages or malware download sites, aligning with the 'Spearphishing Attachment' technique. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine rankings or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/da0ad66cf2afe0c7b31d47372761ebd5/32873922860.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160878c8973926---58468174995.pdf
    • https://ljlconst.com/admin/images/file/rivajudujaw.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc769d7012---4618451926.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/e99e690bcf2071cf9da6db4f0aae874c/13115915972.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5bebb9a0---bugugilelox.pdf
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/16138853600.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795f2bc7713---59637688973.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0652a097f---45888673135.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/14a906cd035d3b1ccf5c4bf74a93ec05/weriwavafiresosu.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/01776s7523hlrc54eco8ih4nlm/19076256738.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2ada3b5a481d6d5aa872925383ff6931/dumak.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a340b6ee408---mozoxinavamo.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/852b7b4a5f9b290ff7f9f87c86b72f6e/34033808199.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160bffc3a5ae22---72013016280.pdf
    • http://dharmapremipariwar.org/userfiles/file/95065528520.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ff863369ec1d963338393109a6396fd9/tagurewazidatisexojob.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adede17a1e3---71024036994.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608143910e551---32812015916.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b12f483c752bb906ae9544f7d5b8ebae/wevosigogopewovipirux.pdf
    • https://people11people.com/uploads/File/zitipowero.pdf
    • https://pioneerlift.com/upfiles/editor/files/viwitikukiwafijevoxe.pdf
    • https://songod.vn/uploads/image/files/raxurof.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nosazepilenemuleti.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=together+meaning+in+kannada
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001701d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1701D 16792 bytes
font_01_sfnt_off0001882f.bin
6c065e40b6c3ee235f7461f6e74dbaf1e75724ad5d84872fd270a2d02984eda3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1882F 20396 bytes
font_02_sfnt_off0001bb83.bin
5bb716d59abdcaa90882c26b962adfa54c5f941701f66a094e29873d01af35be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB83 16276 bytes
font_03_sfnt_off0001d19f.bin
2e4a9ac6414762fbe779d2bbc2bdfc1bc951fa72da0d2ff1da2b0b1af6498bfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D19F 10536 bytes

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