Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c828d1064c3c23c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 13:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d8e253297bef7511ba15a3f0d4cbf43 SHA-1: 99e2cf5e11379cf01eb23748f4676e49c59924d1 SHA-256: 0c828d1064c3c23c697303b76106281d68d3aa6d87f715f9dbc2688ec9a3ff29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further supports this, indicating a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=product+manual+guide PDF link annotation
    • https://mvpartners.be/images/uploadedimages/file/bixitakovokota.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/nejedegivijaxoputosubovun.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/duvib.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/50526140227.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612013dbc7f93---39161572270.pdfIn PDF document text
    • https://businesslife.com/content/file/9697590474.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec537a4bab0---49903094421.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/bobexalifivodofuribiguriw.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/34757045971.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c1a55268c7773b3938f9b369d2d00fb5/33055685550.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/putuj.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/54444317141.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/47f562eeed9f67a3d434de82159da929/bixij.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2fa989c40021be175df4ddaf1aecba81/27820206247.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210708_170027.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd966d38848---dowirofokepus.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bdfb72e69---jasibesevufimufovoneg.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/bu8da9c3jt7iacbj31lab2v5ro/76746456435.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/9e5f816def9a7a31679af334d5bfd2ea/19944289768.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/bepofovabepanojebaduwomel.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/bakop.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/9929613007.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/jagobirata.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608896d624e67---67347250066.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xazurikatapu.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_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 10648 bytes
SHA-256: 7e44ea4194ae80496c501af7072df18043b555c6098de85c2bad6bfe412c856b
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 17868 bytes
SHA-256: 31b38bc34c5eba5d2da9544e39b08d8f3d8af173517ff9fdfe902c64ac087ef0
font_02_sfnt_off000127c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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