Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5232c2c872b95e…

MALICIOUS

PDF

95.3 KB Created: 2021-07-05 18:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6e425029514ebd06fa28891597cf75bb SHA-1: 62ef6943beff51f63d57580eeaef16035801d54e SHA-256: 5c5232c2c872b95e1ccb4b547239ec9e53f30120a19498035d0e8124ea89a4f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to websites hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised infrastructure suggests an attempt to obscure the ultimate destination or to leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/00e4499a786ef802f6a7cc3eb6c926db/13073111463.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qfgeo557ujukn18p8l72pqpav3/wagonasadal.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/24046518343.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/wamunepamigi.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/jiferukofekuxuluxowosefa.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fodegujezobiwigosigifi.pdfIn PDF document text
    • http://normel.org/files/upload/file/17436852306.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/486326d8a436a55ef28deb1a5cf70309/murodasuze.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b40bd26c20c85d1a7d5c5ecebd59c1cd/folalojulavup.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/208gll1i83tf92ni6qco92m37s/36242473.pdfIn PDF document text
    • https://norservis.cz/files/files/74144557526.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc89bac4ef---tirabazalovalupir.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/0dirb10q5ed9t11m5mkhi2e8b4/58797914790.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/2652d3461cc127ce4c66ba756e7f633a/xamonux.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a983d3bb7f0---muvikuvaxogado.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ll6smdk1q0its85amhfj4elbes/70846582868.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/xabukipawetewexex.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/d808673b5f8f0744b8bef7271b246f2c/47081000761.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ce9db73ade6229ba635c637ddf377d21/retadulosurojenukuwibudul.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/mpgfud3scg59p75ff00acrfbj3/95370249265.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b9c19617d1c22229e02d0b5db15556c5/kajexatikodawafexukux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=giant+malamute+for+salePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 17488 bytes
SHA-256: 7d3d9986ca31464ee948125cdd9c0b1928bd2244adcbd2211bc47f90b3d4f7fa
font_01_sfnt_off00013eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAF 10512 bytes
SHA-256: 056547c3754bd02c188a2a7583031682537fbbba76ddfb7912b67940d4fed8ed
font_02_sfnt_off0001569f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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