Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb611f26da1f689…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 13:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b40e9af613c2061b82a308505000e8a7 SHA-1: c247bfd8453814a193ea7a595dc737bd536a3b39 SHA-256: 3fb611f26da1f689b886f262425a012791b0b6b93648552b0144a0b49dec94f7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://holcom-solar.com/webroot/img/files/jijamegepava.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de2867683d9e9aa5660aadbf8f2c3040/rixenofikujopujul.pdfIn PDF document text
    • https://atavio.ru/files/file/jepibat.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/50eba370573c7eb0625da1ef6a61772e/xogojagimaginoji.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610680e8eb496---dodewum.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bb02e6d274f---verusodakinologepepetat.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/6970575627.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/mizixoxofozotud.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/71374753031.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/rolevepekav.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/qjpooce7l1bas9jkeh3ilg5tq6/nivokatu.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/kinilegoj.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/8fb979bc933deb53dd7a9ec84caa9c9a/76573624123.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/93517954613.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/hgmhi0bhnql62d61vfbl526aag/worilupefojela.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/sijixana.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/25b28ca82387db130ced6e18cafe48d1/jojapawotugokogijorififoz.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/13313165199.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210707_EF4F36300027F06A.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66cd84075d---44063998129.pdfIn PDF document text
    • https://clove7.com/userfiles/file/nomogudobekivewef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=best+free+pdf+editor+windows+10PDF 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_off0000dce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE5 18116 bytes
SHA-256: cf05ae39f839c6d4379380eaf55f10d7d896ea363084ef08b74a770b06a7de10
font_01_sfnt_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 10596 bytes
SHA-256: 202dfeb126ab3dc3f9a01aaba3f4d652165cd894720447289020d6f24fe68cb9
font_02_sfnt_off0001236a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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