Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c07416946e573e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 00:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4698d88d373e495a7421fb7b52bd8017 SHA-1: 7a360b1859ac4c16a2e7cc3e8e3a11e108f5ba81 SHA-256: 67c07416946e573e7b5bbe983a634af0d4eea2a60836f21df78a4de78b3243dd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. This suggests the PDF is likely a lure to facilitate phishing or distribute further malware, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=class+%27knp+snappy+pdf%27+not+found PDF link annotation
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f601e1f043---95844029242.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/60196162397.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/1e9qtlm49pqjcabt0e2oeuarch/fenaxuxuxobuvowovi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/53184136012.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/53528643908.pdfIn PDF document text
    • https://birudongker.com/contents//files/radarabedatewovawu.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/fovujusinemoderaboluvat.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd0987bf3---5754431284.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130006948643---fikirerisogodowovesifile.pdfIn PDF document text
    • https://filetorme.com/upload/files/42387570826.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/58572962201.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210527010724478.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/6126536685.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/4974fe21e9d3df27d1212988bc24bcce/katevovazudajoguxomed.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c9adf0ec8---mokonij.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75dc3ad82---42640560781.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/58889029349.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b41395b63ab4062338a67da5fb854da8/kupoxerojadopelediladu.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e5c86b5197204cd3ed3958cb9219a1b3/30550300335.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a4cefaa5---53884949895.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b2d13504fff23c9717ba5e5a3b7b929e/kagidim.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/43797879856.pdfIn PDF document text
    • https://bselink.com/userfiles/file/23223006122.pdfIn PDF document text
    • https://advik.net/userfiles/file/4114588363.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_off0000dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 10540 bytes
SHA-256: b217c0f44de3fd3b5064b13d9973177a53aeaa723cae20d9d91cc285364c4ecf
font_01_sfnt_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 19152 bytes
SHA-256: 56cd18db4297609e74b43151137f48f2de4942c86101bf377191f1790095d176
font_02_sfnt_off000125a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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