Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38f3a1690ed25d2…

MALICIOUS

PDF

81.6 KB Created: 2021-07-05 01:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d354c625624afd48788f191a51ea33f8 SHA-1: cfe408522396838841516eb7a49ccd3fbe720f38 SHA-256: b38f3a1690ed25d2aeac544f8e6de9c0f4e71fba1fc4cd43a931bbf37f348408
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, hosting numerous PDFs on compromised websites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The embedded URLs point to these compromised sites, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077b692da698---zaruvovorikelekuvis.pdf
    • http://go-pxl.com/uploads/files/82635058645.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ip6egtbk8be7993ttjso732slo/84730617668.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/6c2de2571c34018283ce94ef0cc0daad/30535839227.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2474950c8e---73195380184.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae55da2bcf6---depalozozijoved.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609269ec589c9---85074033495.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/66157025201.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79a7838b74---lupawulelusagivis.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/h585c7ip417scqq1fn7pbrlft9/gozuromi.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/nker0k9p0rnacbhvflhcc3ma2f/14278563550.pdf
    • http://viprealestatebrokers.com/userfiles/files/webusigijivivitazolexe.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/27160328539.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1aaaa8c7a---wedonimafelodedukizu.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be094c6a42f---kaxarusebegefararor.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e67c7a9fabd09c0444c0604ac67a7898/bapojapumetagedemu.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd75824d1a6---fafalope.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160860d37148e4---9388310209.pdf
    • http://atek-ent.com/upload/file/mekajunabibavavopitobosud.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a883cb6a996---jumifaxajutumibu.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29f49a4d79---nidakegajexaxib.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86252cf899---zisukusuzara.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=reliable+industries+cayman
    • 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_off0000c9bf.bin
f1487cd8b7969c1ed703b138cb13a4d2b44da58fe9c677319c76cb3574cc15d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BF 3912 bytes
font_01_sfnt_off0000d8c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 16792 bytes
font_02_sfnt_off0000f0e0.bin
0c7aabf3cc77fea8f4cba4097e70ba4837b4cc78178797a3e4abb917859867e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 10808 bytes
font_03_sfnt_off000109c7.bin
0baef141c8a484083d48c5902671e8c811233b277c17c1b2c713021d5a89d44f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 18144 bytes

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