Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3796fb12a95d4e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 21:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01464507600005575639bc66091c9690 SHA-1: 368eb46d2888d42a82ed258fc52b55e57fbfdf31 SHA-256: 8c3796fb12a95d4e14edfdc2ef90b0b503bc9497fc765a16cba8e3261e867669
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely leading to further stages of infection or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=nom+026+cirugia+mayor+ambulatoria+pdf PDF link annotation
    • https://bocion.com/ckfinder/userfiles/files/ponororipumatodukodixekif.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/fizafagizino.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160754b2359111---kimowuzamumovubejekupiber.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/68613504533.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afd62751d8f---96173683999.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092492786b8b---62664156462.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ul6ostbfbjjgi862d3qomt1sml/xupibufujug.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/6u59gchtib9mupgit6jh1ks8cn/buxeporogubupejomabegepa.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/renerivupapifapaxuvitojiv.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/736eb95283dbb6a89c5f593e617a08de/lazuxobi.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bec69f468---5921503033.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f66793af0a5---379526950.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/88622434888.pdfIn PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/3749932752.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/mirefoxabilapojeda.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/13c35eb937e1a9883ebd451a5be0b1b4/91698964659.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612a7285816d3---nolufulolaxibowamagetiv.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/64747294405.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/zinawowolubupib.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/zotusofanopad.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_off0000cfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCE 18296 bytes
SHA-256: 9eba10c0b5f076d1e3ef19a520a562a726f36fdaa7ee3d6c8f157e81f5e7bf2a
font_01_sfnt_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 11300 bytes
SHA-256: 008458016de4b1499a114a050fb214e0c2f566da7562a415ecd2bbb2e3154f75
font_02_sfnt_off00011927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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