Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91fab7dd3471a32…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 11:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce37023cc767ac3fdf6c65ead69efd26 SHA-1: ba9f43a8c5280924e4bd9b140ed12904b45bb0b3 SHA-256: c91fab7dd3471a32bd2a44eef301e2ee655a056e3bfa6813591ee18b2bf6973b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=akbar+birbal+stories+pdf+in+english PDF link annotation
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4f7c19e4081cbe9746ab11967f8b1285/70411616107.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/94809136780.pdfIn PDF document text
    • http://labsshop.com/d/files/jokofaluroseziwerajese.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/jejuxe.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160817a3969be1---30932194166.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/bigebamodilupofebogiw.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/593ebb13a133141064c35def56ce5849/5314515254.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/kupufurepupopowuru.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/33934220058.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/tunaluravozukebalowajarop.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/kelemixajiluf.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/linedulotij.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/monosawapigotanifomoko.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c867fb77aa9---jupazasetim.pdfIn PDF document text
    • https://ferropula.hr/files/37091214160.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/21206593899.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/jitoduwu.pdfIn PDF document text
    • http://elm3rad.com/file/revijizalegogijagatanixen.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/pupeni.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dhe8fccks8coj3k2r614feumbu/89223912970.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/zegeg.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a7056ddfbbc5c5c98dfdc1c3404f1328/valijifax.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jq29jn6c0fto33dekaj8dncha3/wixejifalesuzowudaju.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_off0000dad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 10988 bytes
SHA-256: 651a114563e3299aa84e8f8f40417681a25f5d728c04c453cdf97a86acd792b0
font_01_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 18004 bytes
SHA-256: b47fb9dd65f3e635d63eba2c4a1c88175582ec0213138fdb0cdb6a5c0a2b1ae5

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