Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f22f1179e464d8…

MALICIOUS

PDF

89.6 KB Created: 2021-08-21 03:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9ad3530fd7ac033df4a4a6541d29cc7 SHA-1: 2362ea764cd6ff27770fc637ab7707d5b33bb6be SHA-256: 40f22f1179e464d8d91321c81429d972c9a287e6a55cfd172eafa1789499bdaf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of a link farm pointing to compromised WordPress upload directories suggests an attempt to host malicious files. The document body is heavily obfuscated and unreadable, but the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://manpukulivermore.com/uploads/files/jojapukexiwowomuwudiw.pdf In PDF document text
    • https://cgeminfos.ma/upload/file/tozozawunedabe.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717a4ac706d---18887095718.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/af19495bc74d28fa17aeb966b5430cf0/suxawabojetulilovuxe.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/079b3700a70d8ffa9b2822574cd1df00/37371822533.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://st03.it/userfiles/files/53519922546.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/puteruzegesibumuzinidom.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a922783719e---nijoferogapotamafafamivi.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5ebkbjqavkm3bij1fsuq8rkfq4/98256650914.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/92657607729.pdfIn PDF document text
    • https://aashianarealty.com/file/wazurosojevuk.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/vesovasomagobujiledarexul.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/8469973789.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/talopobepejofe.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/28406236907.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160805aa664689---13642467505.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082ea059d492---rowukegeminuwufegupexap.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202107/file/ziketusus.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7997b14c57826c2e705a5dff9b94b3e9/67298449803.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608334bbe82f5---9463041572.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/70160763055.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/wufulezerifan.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/867b07028ccd27dbef2ec005ede481ee/gawebadixelumaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=buku+belajar+bahasa+arab+lengkap+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 16892 bytes
SHA-256: 7bb558c053dc4e043e6ec2b99395c9865f054a5c24d8cc6c1cc1224a35179b35
font_01_sfnt_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 17256 bytes
SHA-256: 72df7d9237a4712ace1207c7662df17de95b27914e5d15f6fda39d314737627d
font_02_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E67 10984 bytes
SHA-256: b5f2c2b7f58fe45fe7f07b9d5a52ac62779d55d0bbff6d26e7e025353bec3ed2

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