Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9bbf47f9186b42…

MALICIOUS

PDF

75.2 KB Created: 2021-09-07 01:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 386fb6cc7ebd9865806d3335d489cf71 SHA-1: 31a885ced4466adce4ee33e30c81472fb4803338 SHA-256: 0c9bbf47f9186b4237877ea211506e9dafb0baf813802735f882703ed32831e9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites that appear to be part of a link farm or hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The primary attack pattern involves directing users to potentially harmful external content through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://asbazainville.org/userfiles/file/numapojigowedotafimavopig.pdf In PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/70771368948.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/zujeketilevalad.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2256266ad0---33954567481.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/gufoxekotowalu.pdfIn PDF document text
    • http://vina2002.com/uploads/files/28203386690.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/15769008497.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4c68029a---lijiwakegojagexitilovigex.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/77414752268.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210614234711_197563160.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/03aef6c729ac0dca8d39324f273af3e8/maguguwezoturixiwufug.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8796ae47e---98723017048.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3ae14dd87b381886decd36522d48a9be/salefexevebip.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/43290747673.pdfIn PDF document text
    • http://immopolignano.lu/images/65178959463.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/11651495208.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/24738887661.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/kidam.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/jozesok.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/734b45a05e040b6662e36c440dff8466/96360908323.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/40049196600.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/ginemakisevu.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/gugawoludo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=add+stamp+to+pdf+bluebeamPDF 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_off0000c02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02A 10584 bytes
SHA-256: 21b317f3727094b98d8da76963313c1fdf2d38b731994bf842c33d50963067c5
font_01_sfnt_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 17968 bytes
SHA-256: 05e8ba50a05baf69c8232e9aada899b2c35129567ca39fe7b2d11919d751a29d
font_02_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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