Malicious PDF — malware analysis report

Static analysis result for SHA-256 f605b8c04807f432…

MALICIOUS

PDF

75.6 KB Created: 2021-10-11 08:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 075190eda5b96eab92e2ec4862e3c3d7 SHA-1: 3017ceca8e9c9e758741159261ff67f449d21d9c SHA-256: f605b8c04807f4329e4e2d30f4ea86c19558ee4178fa1599f3ba8a3a8828679c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates a likely phishing or malware distribution attempt, potentially using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://coretry.ru/uplcv?utm_term=quick+pickled+celery PDF link annotation
    • https://rajakeempat.com/contents/files/zojak.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615fd84215e54---14437495948.pdfIn PDF document text
    • http://eternaseguros.net/files/files/49200673904.pdfIn PDF document text
    • https://majubesar.com/contents/files/14159112947.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/37867994242.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16155faa00f49a---kidosut.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/97299843239.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/vewewasogov.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/60253146343.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/boxofelujige.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/25829334804.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4ccbb7b1baae1b0b690de05d8816aee1/5913795030.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/kajozov.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/53207001429.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/gapomigozugin.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/34048853584.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_off0000c1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1ED 10220 bytes
SHA-256: e0db55d9f46922baab93ffa03a4bdbcfa1ec5f82a78feabbfbdf00247b6baf6e
font_01_sfnt_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 18460 bytes
SHA-256: d72d31ae1c394f02cc67f578c8bd5952f1bcda7f6bf65dd7034df095a34bb406
font_02_sfnt_off0001099c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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