Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab56dffe96cddde…

MALICIOUS

PDF

97.1 KB Created: 2021-07-04 22:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e449c11095a2debff0ad3b7f974e06b SHA-1: 41a14347cac30c8b5bf3b31ddd23acacebf74800 SHA-256: bab56dffe96cddde6efbff25249762939076d56c682a5fa823febc0c3cef7b07
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76e7382667---2551415091.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/3c6fc22bec470bc7ee93cb1bd052183e/teduxuwukikimogiluwuvoki.pdf
    • http://studiospazioambiente.it/userfiles/files/70970382064.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607330b8c82d0---36015371486.pdf
    • http://budoprojekt.eu/obrazy/file/33314844571.pdf
    • http://agiusfuneraldirectors.com/files/file/vupodejujowamakegusit.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab35bb7c816---jizejonalakutovo.pdf
    • https://elesud.it/img_pagine/file/89054314214.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa18ae1a8e8---1907186233.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ggduadhr348iarto59kt9pnal3/93478387841.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/5fc341bda5f6f81b1e52ea82e097b3e6/fiwemawobawemibetisidut.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d692a6d01900b8086d9da096edf4ca70/68355796510.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48782aadf---gudiwupidiv.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084d822b5d55---41893270076.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec08c0c050---rukasemaro.pdf
    • http://websurin.net/UserFiles/File/widukemaludupufi.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbfc584e30---davagepezuxudu.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1f40c8b91b2dbb9e2ebeffd7d894d697/roluwogefukanaguxalajera.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077893a6fe81---xawadurokenowegi.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160802dc6dc7ce---tidurupeguxupug.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/7p9j7s0hvgaqushd4umu7hr1h0/74159825045.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=parenting+stress+index+sample+questions
    • 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_off00011662.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 16792 bytes
font_01_sfnt_off00012e79.bin
b87579215a520bd546f06b68eb04037a28784e0207fa90815ff0a4f7637b8274		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E79 11084 bytes
font_02_sfnt_off000147c4.bin
02efea02ce0febf6a6224accd4e66caaa7ae3e7946ba6b30f4af0f691c28c834		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147C4 18176 bytes

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