Malicious PDF — malware analysis report

Static analysis result for SHA-256 54994602ee05ce2f…

MALICIOUS

PDF

70.8 KB Created: 2021-09-13 12:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d74f7b5a9500e5e963c039adfac7dca3 SHA-1: 0085da885ae56defcf9c782f1defd0701584e6e0 SHA-256: 54994602ee05ce2f6450fddb9e1371f14dac437940226180b28d222e36bf7743
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards a social engineering attack aiming to trick users into downloading unwanted applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://catamma.ru/uplcv?utm_term=watch+dogs+hacking+app+download PDF link annotation
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613079ef309d3---45426494615.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/kafutetigidezawovo.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/nexibazun.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc65194eb---zufetegus.pdfIn PDF document text
    • http://rts-3.ru/upload/files/vafifewosifareniliwipi.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/teweponufigo.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210910214425.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/rflnbim7ie42b3rdun3432bue0/79038599757.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd0ae9f70---dukofikoripinokutig.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/89959744016.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/lojur.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/31955772714.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/15292342258.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/fonilenoduzemul.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/37025083786.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/10931988938.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/53966379318.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210906_21156C9E3BF0FCBD.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/misafexumenanasose.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161372935a01c1---78225852073.pdfIn PDF document text
    • http://www.pilartangguh.com/file/lokatesokulovagedelis.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/30228010138.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_off0000b599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB599 10732 bytes
SHA-256: 9cdd1557eb1b8ccf5483d5cf265ac396b87bb0be661a9c12dec10e4eb092f390
font_01_sfnt_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 15276 bytes
SHA-256: 028891aabe8817e1f55f17672ffde649b0ce53dc70dc8b33fc47279114b7264c
font_02_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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