Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f6a224528ee4db…

MALICIOUS

PDF

73.6 KB Created: 2021-09-02 21:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 656fabd57856bf5ad6f72f0f168335c9 SHA-1: dc62155bd895a86dbff97308cc9bd84da8b1adaa SHA-256: 78f6a224528ee4db16ce35130797a5080645f6acf179461248ee6e33a7c41750
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are likely compromised or disposable, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and a link farm indicates a likely attempt to lure users to external sites for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://myphi.biz/nbloom/fckuploads/file/82781147841.pdf In PDF document text
    • http://sualpturizm.com/userfiles/file/xekebemijosewikokovob.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/zekogewinokanolatixovi.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608886fc13872---gotufef.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/66819000718.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/98815916032.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/63848061b9759f6cd790c293aded5d3d/27811913990.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8e2002dd7e8c22dffb4cbffc21ffd1fa/pajedefexosobevomigetun.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/39b7dd9e14de1cc56d7a74c9d49dc250/febebi.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/94517814178.pdfIn PDF document text
    • http://ipceurope.com/assets/file/15536646405.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8bde510cd---zipobez.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/pivavetadomolu.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/dosodurijerizekawem.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4k76ekg6ppcmiu2p1o0spg8lnf/63678652089.pdfIn PDF document text
    • http://cga82.com/admin/File/85843517432.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/17341443103.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a20b6d7f661---berufefudolezunusukapoju.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/89761685103.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/30396986417.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735ae6a6dc4---bifepilitagu.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/36163122165.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/33082367462.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/zuzeperajena.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/nusavibapunomazipem.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/43096731589.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/xuvekupipule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=homedics+ultrasonic+cool+mist+humidifier+manualPDF 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_off0000bd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD76 16684 bytes
SHA-256: f50967b1c1f44825d96daa8289be3f5795614f72e1d8477834d438cff0586087
font_01_sfnt_off0000e7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 10832 bytes
SHA-256: a63463561986dab079eae65c8f5aaa1af3edf7d7e7b1196aac634ea644c7fe14

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