Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8843ccb26a9284d…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 21:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 01bb8dde67de0b1e0418a18bc2d911c1 SHA-1: bf9c4bd0a1b6689b0342cea6e30dd6f1e6d6ccb0 SHA-256: c8843ccb26a9284d2d72dc5bb76ee3f7cfc3169004e2e18e349aa11422aaf4fb
156 Risk Score

Malware Insights

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

This PDF file has been identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains phishing content. The numerous embedded URLs point to a link farm strategy, potentially for SEO manipulation or to distribute further malicious payloads. The heuristic firings suggest the document is designed to redirect users to compromised WordPress upload storage and other disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=kijang+innova+v+luxury+manual PDF link annotation
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/8941b807690cc72840ce11d693bf16e0/sevigamowatokemazer.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/45337306246.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/91572776048.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160837b1c69d46---peduwaxezadujisejidu.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/wetuxawupeluze.pdfIn PDF document text
    • http://chapelguild.com/images/usr/71267936641.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b09201032b77e472d859b0268b0678f3/kubeloje.pdfIn PDF document text
    • http://martonelektro.hu/files/file/raxumim.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984ce99f68f---rudofuvejubitupubad.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089a531ac1c1---19616164365.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/dunamefamimenezokudada.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/34043367188.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210904014143_igrm3x.pdfIn PDF document text
    • http://tafoto.de/img/upload/files/zirebef.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/8946848632.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/sonatiwobarupi.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/16377636485.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/6077712426.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/sanesijezozatakodenenuri.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/34582209668.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607df00e7a90b---74377435325.pdfIn PDF document text
    • https://mattress-leader.com/media/zobuzalotewigedazadejatid.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/togowufodijif.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/49a7c8cdd2c2b88becd9b69acc0c4655/gojagelebosibuba.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_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 10556 bytes
SHA-256: 5b8c6ef432f4551a8608c5a46a314ac4a7e1bca8b0715758bda4d815ea7e6235
font_01_sfnt_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 17380 bytes
SHA-256: 3ee80b56021716d654dfdde382f2042a333a6b8d8852e1a7c74a4e259df9db37

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