Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13c346af505f65b…

MALICIOUS

PDF

99.7 KB Created: 2021-07-03 22:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 632f967331bc5d8d24a5bb2e782d07fb SHA-1: db981f319e27042a80c07ef57ca07ff7a8af7d03 SHA-256: b13c346af505f65b6562c4cb6eba4cc45c3fb1f16be1d791216bbb08504c2ad1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, specifically targeting the 'formcraft' plugin's file upload functionality. These links likely lead to further malicious content, such as phishing pages or malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9856

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 https://oniceh.ru/uplcv?utm_term=cool+lenny+faces
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a097f0c272a---jidimalodolu.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac6c098ce---23587828741.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c7bc94fb6---39029337153.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/a9j44k2vsifq4heuju5l2edf65/disoditanaze.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/m1e38sgvt2cva959guensiekfe/1561761035.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609294ee13497---wopitenonimasiwupanuk.pdf
    • http://alfavit.tv/userfiles/file/7351369404.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082eefe3c2d0---kegusevazagixezutariwefap.pdf
    • http://kezmosas.hu/files/file/kaligigejute.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/1afci8odfjeu55bub2rab5e7qo/jexokinilizuziwubalegiz.pdf
    • http://frigotechreina.com/userfiles/files/bozivoralemuvageni.pdf
    • https://virtualpulse.eu/UserFiles/file/raselimotazorasujebasiwu.pdf
    • https://efnnma.org/files/file/48042559218.pdf
    • http://paillasse.hu/userfiles/file/42208914429.pdf
    • http://group-anons.ru/userfiles/files/69506555117.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23e8778652---gifutidanipe.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cd359f537---jomotuvokurekexejopaze.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/15d4b6f65bfc5c2de3da43d2e391170e/danarubarosa.pdf
    • http://boathousebrokerage.com/userfiles/file/13335502929.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609c36d53342b---nutajakituwujesap.pdf
    • https://steklo-shik.ru/userfiles/file/papube.pdf
    • 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bba3.bin
084aba20f45b3af06b7ac479f9c47f2f4f04d28e681e3ec8c8cf5ce34a72f99a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA3 8952 bytes
font_01_sfnt_off0000ce02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE02 16792 bytes
font_02_sfnt_off0000e60f.bin
496dc3463e0bfdcfa4d8553fc2653fb37fa498eb60d80c4080cb56bd87d3dde1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 3540 bytes
font_03_sfnt_off0000f45e.bin
073ada82078b8673fd24c0cd110a673686b744f2bc3d3969ad9f7784ce4e9913		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 10184 bytes
font_04_sfnt_off00010b63.bin
a733b7c3a4c3a6f441fe5034834d50b178f80c9d1e380043411e63f6a96fa0c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B63 22920 bytes
font_05_sfnt_off00013643.bin
aabf6b5c6bec102ae2ccf69a5dcccbbd56c8af1282c277a6dce83a01db3c5674		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13643 26988 bytes

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