Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b962a6d49c08148…

MALICIOUS

PDF

75.4 KB Created: 2021-09-17 01:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b52e29cdcadc1649b6e48c28655dc598 SHA-1: 33e481aa14bd0e5e897e2ed750d6837b24bc14dd SHA-256: 3b962a6d49c081480c67ba3c1f836840c4425a32968ae72a386deab025fd28c7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised WordPress uploads. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detection confirms it is a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

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://krisoc.ru/uplcv?utm_term=fruit+ninja+temple+run+android PDF link annotation
    • https://rajaketiga.com/contents/files/zirazidupaf.pdfIn PDF document text
    • http://simonide.org/userfiles/file/bojosap.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/3719941963.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/zaxodiwubume.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/67656206388.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/23482742595.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/jabizevasaf.pdfIn PDF document text
    • https://nomortiga.com/contents/files/63833418250.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/5366332158.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130ff524456e---dezoruk.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/73389891552.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/kasade.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/jolazobokebopefejuzeraru.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/papev.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/busnh8igvek7uas2v7ov3m4bid/tijojesixudusosozuwuxodo.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4vap17dcj0j2anf0ha39n2kds2/8883006202.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/likipoparefudigobuwijataw.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/xabulusojoxizezofufawuso.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/jexasagevasipimugorisaj.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/j6dgbro48tqb23brfngqc968l0/18939938957.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/peguvofeketudomupobes.pdfIn PDF document text
    • http://erictex.com/ufiles/files/vopukufitabonunesapale.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/65046177230.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/25460610487.pdfIn PDF document text
    • http://www.siposferenc.hu/html/35372038223.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_off0000c0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 17588 bytes
SHA-256: 5ccf32f1970d06f7e232141a18a76150fd0e3b1ca83218e7163e72b45fd86acc
font_02_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 10592 bytes
SHA-256: 55994d925deb7223e091165db0c6ca43432dd47e84199050fe8c0e352c79ab31