Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f03486be5037c7…

MALICIOUS

PDF

78.5 KB Created: 2021-09-05 17:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37f2e5ae675f24659043f7050b826405 SHA-1: 18b609d2cd8d745c25d9cdb5f6afd8900e5fbd61 SHA-256: 91f03486be5037c79826e4d45474256c30d5867facbf3dd84191548535eef6c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous external URIs and is identified as a link farm, likely intended to direct users to malicious websites for phishing or malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supporting its role as a lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=mankiw+gregory+principles+of+economics+pdf PDF link annotation
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7b6ec92ce592bf4f398009047c148bf2/zotebivuwasivowesir.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/2ciuekt78r74uovoafscnbocm4/13795950502.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/zigapajogewimas.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/lowodo.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ebc25064678331b661c82c5fa3f3a1ce/21910307867.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/75636313029.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/77892903874.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/zefedixawonojonefagozebu.pdfIn PDF document text
    • http://balone.net/_upload/file///11046058571.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3cc50d1ef---wowoj.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080da3b579f6---mojuxusexena.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/dokaxotelejugeve.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/3972139023.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/lowenasak.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f55183bdc91a68ee3a99f077b575d42f/bamurowumitiponesu.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/kuvetuxo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea376e5e0d---tavewopowu.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbcedbde7e---rutoju.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/67169448756.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8552a768d3473a0526644c614e21ce8a/vexulomomofexeb.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/suwakazumazutofopelixe.pdfIn PDF document text
    • https://synersys.fr/contenu/file/93809704537.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161306c804bbf9---boruxujuxobujijubilonul.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d688bc5b762---wuzodipasafaxasiga.pdfIn PDF document text
    • 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_off0000cf80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF80 11152 bytes
SHA-256: 5e38c1ee3b8c17f7f81d7f22e2c0487fb7c91c7a141b813d6e9096cd88b6c4c8
font_01_sfnt_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 16436 bytes
SHA-256: bd22274f6be3473ae6e2ffb7ed047264ca96d9e7b7314209dbe77216cea30835

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