Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf79de514c837451…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 19:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a3122dcf2a3e2dd58565957ab8df0979 SHA-1: 11afed6efc647c9c58650846d57b92f6f4afef7c SHA-256: cf79de514c83745143db48e8366b82fa58046cc5550b7e0613dcecd2ead5b72e
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to press Win+R or paste a command into a terminal, likely to bypass macro restrictions and execute a secondary payload. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://mmbc.cz/_data/user_files/file/pelexesarinexadizakuzini.pdf In PDF document text
    • http://mecaniquekd.ca/upload/file/xafetoge.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/92712451432.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b451464a6b---89586128766.pdfIn PDF document text
    • http://naviway.su/upload/files/63556267154.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/dikujokudukezozivizip.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///tumidolubovejavi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1334f31ff---93133773389.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/nevevumefidebetakezir.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/17c30affcd80507f2cfada94a6a42274/67685610976.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/dopeto.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/naluritewajopinelanu.pdfIn PDF document text
    • https://digicpictures.com/downloads/lavaf.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/famofozijafiladezesile.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/64626575895.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/143e58f9d4e7284be46c79c882252af9/vasavabu.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/wisofogoxoridewi.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/a5165d864c67aea9c910ec3fb67b73ca/xivapoluvugekekotur.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/085b8806233fc133454d124f01820ce5/xetabape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+pdf+editor+for+windows+freePDF 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_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 18460 bytes
SHA-256: 9c871ecc953c80a496a6396f905f2f91be23680b4391873f71ae22ab179efda0
font_01_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 10424 bytes
SHA-256: 13669c439eccf8b6b983a22522db5408146513001fcb347599de5e972e406933

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