Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4827c5d7cd42f1e…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 20:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e41c7aaafa0b902b7c6254760cbb3c95 SHA-1: bbc99e178431b7d210e470883d956d2f7814efe6 SHA-256: f4827c5d7cd42f1ef91ac009e4420d940f6ad11f035847c475326f9d59a2d45e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=labyrinth+full+movie+online+free PDF link annotation
    • http://gpe-el.pro/ckfinder/userfiles/files/25500456556.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/79504158802.pdfIn PDF document text
    • http://anninhsieuthi.online/upload/files/56829684249.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/vepupovodunaduweb.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/57285145880.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cf89ea10f---tutuge.pdfIn PDF document text
    • http://farmina.ru/uploads/files/ximikalagaviluvulidiw.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/31620630577.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/polem.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/ridipijimulujalexemasu.pdfIn PDF document text
    • http://lovesenergy.nl/file/68391055845.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0ba13d75---tefininori.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/61039533776.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/6392700900.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2f7543b03---84161902922.pdfIn PDF document text
    • https://thomsonindia.com/userfiles/files/bixukej.pdfIn PDF document text
    • http://llux.vn/uploads/files/kawelubamegamevafiwopolap.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-10/6217215c0532272eba273fa4ef9ab0a4.pdfIn PDF document text
    • http://tajilin.com/upload/files/41365102939.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353a05e08a0---48545533467.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/26709916859.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/96ec97446ae86ba9a0535c7438343edc/jilajugasu.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305ce7db23c---xopevamitagivew.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/4962965184.pdfIn PDF document text
    • 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_off0000b360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB360 14792 bytes
SHA-256: c1dfc97740b286c807ba6123b720712606cd35b42d519b9503812afaa2218303
font_01_sfnt_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 10688 bytes
SHA-256: 863558bbbb9114d90ddfa6fccdc239bf9bba60969af839bd71e0fcf69d3eab9f

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