Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4250668ce251d7…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 07:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 072e9defcef6ea9970ad6c61e6c1ed30 SHA-1: 1ad0269fbc320ae8033b9a2e063b38f9a7af3355 SHA-256: 8e4250668ce251d7f250508cd91fc7e13a843014b51580c7a14758b0316d271a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious sites. The primary attack pattern involves luring users to these external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://laborke.ru/uplcv?utm_term=converter+xps+to+pdf+online+free PDF link annotation
    • https://kimtuong.vn/isc/public/files/fckupload/file/salowusilarobusujuwagemu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd05f8ca8f413f186142cb4db7b62ea7/53638230793.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/33423247498.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5d75a007---4571580791.pdfIn PDF document text
    • http://prestopc.it/upload/file/lusiranugisobokinavubok.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/28803274850.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/uean9inhclsu44jbhpthnt15l0/pamifo.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/fonodujaruzimedita.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/5ki02uhahoq4nej9a4a0ffstc9/49005059903.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/zuzema.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/12245206319.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/24026320350.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/2486516666.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/77426464804.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/xanalakafomexa.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a0604451671---97759507467.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab25100af12---96607987052.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a9708b85eb0b1b54307ac05749b96936/59440606006.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/57630630942.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/12758203928.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852c1015d94---51513704012.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988873dd966---nuvikezemigaz.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_off0000c173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC173 10528 bytes
SHA-256: 98f9983bc1d6d1dafd78b71affa89145451cc66011235e33d1da265cb01ffd80
font_01_sfnt_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 17356 bytes
SHA-256: 7166713c4344224c90d75ab74d291fbf71553bf8d5a90ae0e7bd2cbef83dfe48
font_02_sfnt_off00010549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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