Malicious PDF — malware analysis report

Static analysis result for SHA-256 7310b1f3f3d66f70…

MALICIOUS

PDF

84.0 KB Created: 2021-08-18 22:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c96cf935defe60b4b67ff0acc50a674 SHA-1: c9899e800926a7231d263290fd4587892647afef SHA-256: 7310b1f3f3d66f70e2e19ae1d983ef029dae014cc6661aa0e2db7028c45af761
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded content are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//rofaxuvibewikibefafa.pdf In PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/78402c5be6986d65a38513c3f7cb9a93/64217902674.pdfIn PDF document text
    • https://educhina.mn/editor/files/tofawafuwodugekuso.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/23167877717.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/wejije.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/pumubowiwapi.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/64043783904.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/f2sfmo6k3rteu9cqcd1h14fvft/25524504196.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/e7d67b2b378d418955f4f8796032dc52/rewifosatijixopi.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/9956961089.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/86019393776.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4207a0fc36c453ac89c42b3c32c12310/durasusapurijotojikuxuru.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/53770586390.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c5b9edaed---14914381974.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6eeee6478---11917561135.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/kezivigedukekisu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/42j14u2i7fgrcb78holdgnmaue/10204112656.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0535818001621213084.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/nelomadikusori.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/93604272012.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7d409acce---vepafojoseribizorovajo.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/xedulonirowaberek.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eff44465e---rapevajekupajapoveze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+are+three+properties+of+polygonsPDF link annotation
    • 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_off0000e442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 17000 bytes
SHA-256: 20de7d7bb529497f03924883a4674954a89f5319181dd24c9dcadd5a98380ecc
font_01_sfnt_off00011083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11083 10744 bytes
SHA-256: bdcadad32f0b3baf9efc46669f94b00f6b3e7a0625de8a11743b9c7ef6eaa2f1
font_02_sfnt_off00012935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1