Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac4b131e40fd003…

MALICIOUS

PDF

83.3 KB Created: 2021-06-29 07:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a258b7bc359962db34bf026fb3c81265 SHA-1: 3d81ad6417f2cc8976bdb7f15a3331075e4b398f SHA-256: 5ac4b131e40fd0037b7e1733bffde788c64fc22d5e24f941ad7d58abad4b0586
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file 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 lure users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=pert+in+operation+research PDF link annotation
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b530ec6eb1b---80361201648.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/55235218365.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/vobogufedek.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/8947654091.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/rematisaj.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b020369628---49344043831.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/oi8i46th7hmr6u0l7tqndlabl4/vijififenuwu.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210628195412.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8219c25ed5---54978555273.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/qj19e77nfu551sm28a8c1sf2e5/gufatidixakupedinev.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d4bff2106d5e209f9cc16dff67a75bef/72983966260.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/woninijeli.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a28f87dcb1f---dibemisamuboxaluwogibote.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/33d9b3c996c828b6895838c649f98644/62326203583.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6493ed57---11788701134.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/32520249253.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/acfh8377gbdsb112tc2ib63ns1/34090897119.pdfIn PDF document text
    • https://agatanorek.com/files/file/16816549948.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/93865bec6011f9dcb70c5d9176664688/paxidufisudirevagubutopus.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/hhhq8us79ofuovjovsa6a70fi6/91501497056.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a42fe3f0ab3---25340731546.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/54467390968.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/jc4a15qo93ds39kkucej6sbn67/netikadogutejoz.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_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 10428 bytes
SHA-256: 8c778650f156a6340bd4ea4faa4c5d8ec4b5d1f6e6d38b21c0a7b4977a259134
font_02_sfnt_off000113a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A5 17028 bytes
SHA-256: dba3421da29583d8893c453c6ce7848964686af2602e178fc51e4fd94e0f461e

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