Malicious PDF — malware analysis report

Static analysis result for SHA-256 0732ff0435d3a774…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 05:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0db281f32c8ff11ed449a555252a9304 SHA-1: 74318a891ea08a74f36481d90bacbb91e76b767f SHA-256: 0732ff0435d3a774cdf0ff99320b7b4673b4c98827bc044c3807fa1bf4053ab1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests an attempt at SEO manipulation or traffic redirection. While no scripts were explicitly extracted, the nature of the link farm and the detection as a phishing trojan suggest it's designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=knee+strengthening+exercises+pdf+nhs PDF link annotation
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/74a9de3b0c2eaf033293996ae415eecb/12914286721.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/54195789473.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/21887115877.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/bisuzibamezutabipomipu.pdfIn PDF document text
    • http://rinsacars.com/files/others/76623647859.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8854q2th61p6g31dol31eq24g8/zabavik.pdfIn PDF document text
    • http://vswet.ru/f/84987223694.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/votuledut.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/wuzumunetej.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/76645517818.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210530_221632.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/vavawofapebebit.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0909174f2be51fb741c6c36a57a590ed/6596416091.pdfIn PDF document text
    • https://soechi.id/userfiles/file/57177171596.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/13995223651.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/72532953869.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267bb3519c---62434855283.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caeb046b8f---52816535512.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/84101589845.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab774ce912---wuwujinitilavite.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/5274353687.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/fc70ec73f265f9473c876470a67a527b/77260874107.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/pavutijavesutukimobubi.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_off0000d69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 17108 bytes
SHA-256: a82b59e6be6bfdbadf731843356a77ba1342df90a4ca2f98fa7dba760dbf589e
font_01_sfnt_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 10664 bytes
SHA-256: 05544cee21f6e15483c2c99d0b316bdaabc42768343573975ebf3eae8eb89f33

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