Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f382337775b64d…

MALICIOUS

PDF

83.6 KB Created: 2021-06-29 00:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34319b6207a5c776b645630f5c835c6a SHA-1: ed1553c988af8f05f657d9d136dc07fb7730caf9 SHA-256: b9f382337775b64db360c253a56afdd3328945f9dea84893ee0904d02713a902
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6834eab7380f5dd363f9c5fed08ac796/28133547819.pdf
    • http://tlproduct.com/userfiles/file/49166901133.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8cf214d57efb00d614863bf3a5abe651/banojekavakimadari.pdf
    • http://altelaw.com/uploads/image/file/piburavupemanovi.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a080b53c9d9a1afaba4fa23875bbd2f9/28947133429.pdf
    • https://rocksoliddesigns.biz/userfiles/file/39914936695.pdf
    • https://keralatemples.info/ckfinder/userfiles/files/71089283270.pdf
    • http://mt-filtration.com/uploaded/file/116046673360cb24a80d7f3.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c363e1400c1---lodaguzinag.pdf
    • http://akinmedikal.com/uploads/file/39251644670.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13e90384b---loburojedezowesek.pdf
    • http://kapli74.ru/upload_picture/14880879119.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4b0c417b---14300065763.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b0782ce4612f9ebc497fa9715e802289/vokazerajara.pdf
    • https://vinadesigndanang.vn/uploads/image/files/15581863153.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/sezikajo.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2958f5dfec---xibupemedowukoxuvinopaba.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc585653e0---vigadotekepemoguba.pdf
    • http://analogsys.com/uploaded/file/12478075160b596cee30e8.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caebcb4008---gezojukatir.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079f776a9144---18392923279.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af712911616---xoreso.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ce14548235df4cdb9028065af0c5cb70/87852995296.pdf
    • http://worldcar.jp/userfiles/files/94210234895.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=low+reticulocyte+count+and+high+iron+level
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f1.bin
a6dec43a9155829e65272bb2842d585ccc07617c474900eaefe1198d16d91887
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 16448 bytes
font_01_sfnt_off00011062.bin
d66d07862b664b6a7459e8b351bd68aec5698601d285b38f24f1a49b21aedd55
pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 10804 bytes
font_02_sfnt_off0001290e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1290E 16792 bytes