Malicious PDF — malware analysis report

Static analysis result for SHA-256 43724bef784115cb…

MALICIOUS

PDF

90.6 KB Created: 2021-06-26 04:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7674e61ca5da89f27083ed14b7db28f0 SHA-1: 306e10a103e404cb1a4d7cc98beed25f96ed93b3 SHA-256: 43724bef784115cb5255f8dca8d7c190cbbfb78ba7bb90b72832d81361bbb16c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the document's purpose is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2a5ee2b3249563c802905637dbc9fff9/nozoze.pdf
    • http://shinies.ru/img/lib/file/watefagidujat.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb13649a59---85718593307.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072eede63f35---wijepuzowotobevu.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ttqnsvth4vdrudqktdcove6kf/figowuvedidu.pdf
    • http://mesterek.net/tmp/97635047067.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a583f8c7d19---21744249622.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/38o4ds166ccqi36r1fa8om0gqo/98732247217.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/3925f62f1d038b5461608ec001d7d3a9/darafafutobulivokubem.pdf
    • http://seksdagen.nl/userfiles/file/92282539200.pdf
    • http://sns.hu/_user/file/kevumatutugosavesajuw.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/moe8kviamrgvcoj46j263kjrts/tododogadolozevit.pdf
    • https://majubesar.com/contents//files/7350693463.pdf
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/76528311611.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e594076a4---tenagewevugadukapavekozi.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876d57a4ecc---24024226696.pdf
    • http://hgbs.de/userfiles/file/luresa.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc0b819f3---xezarimatilugilitidad.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ec303db88---50071103018.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16094478021296---80919807686.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f049cf4f5a8188e27fe26dabe4d3416f/kunaxesizej.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/16f8d2ac48f8c0b993e11671fc4ae841/56499416942.pdf
    • http://geoodwierty.pl/files/file/julofud.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9835bbe5---fufikutotiwuvagunowaw.pdf
    • https://equator-maritime.com/userfiles/file/rarigazuzitazasowugekeg.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=intervention+techniques+in+social+work
    • 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_off00010056.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10056 16792 bytes
font_01_sfnt_off00011868.bin
a1c44cf6b6e1a108e9059e42a31705c6ba0190fd3ad91d52850b3c6eb79f162a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11868 16828 bytes
font_02_sfnt_off000143e0.bin
06886444cce5e3af80136ee15a7271e626ca2523718424946bd8d1b8fa3007c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x143E0 10768 bytes