Malicious PDF — malware analysis report

Static analysis result for SHA-256 021dd8f504fbf821…

MALICIOUS

PDF

69.6 KB Created: 2021-09-12 13:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0facab12abf1a235d1639ab277c8e1d SHA-1: fcdc9ede25c6ddfe4d705aad56405068d5a01c4b SHA-256: 021dd8f504fbf821b862db17bc883240456eeda19070b299bda8cc9fd55c7d76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate the PDF is likely a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=download+game+wobbly+life+android PDF link annotation
    • http://italy-ex.com/images/blog/file/daziw.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/rujenoro.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/26289551204.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/rafukokuluverejuf.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/8999721145.pdfIn PDF document text
    • http://dongphat.net/upload/files/27796554080.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/93409a0618a0bcc5b3b4cb9b7ae407d8/53636049008.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613525f269836---nanutadupaloroxogo.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/banonapexesivof.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161336dcc0460b---67813568075.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/13511419171.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e65b80df9---xojixe.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/23373424104.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308103377fb---nunirulidu.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/31375088900.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/69905252836.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/35026485835.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/zarojoj.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613581002a1ae---refewuzixiwo.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b345fe90d9057110d61c6df52cd51f57/vediki.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c337b01ab9---55635521170.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_off0000b1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A1 15300 bytes
SHA-256: 46c7cfe0b967396a3912eba2b3beb969a17aaf7d6c0edcec5fbe2346c660e245
font_01_sfnt_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 10772 bytes
SHA-256: b0d51d96576d3fd02afaefaa262155ae0c5103898302ddfff3c0640931824cca

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