Malicious PDF — malware analysis report

Static analysis result for SHA-256 40675194d4e976f5…

MALICIOUS

PDF

97.1 KB Created: 2021-08-01 01:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4b22e3b073b0b50739f305adaeacfe32 SHA-1: ed1df75fe1c6ec122a5da2e2b7fe4c6be2836a1c SHA-256: 40675194d4e976f52f659417e5215926225fb2c1d985a0562bfb34f6294a5137
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking these links. The primary attack pattern observed is the use of a link farm to redirect users, likely to phishing sites or for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://zxpgw.com/userfiles/file/xuperiwurobujuzusolodu.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac053ee813c---gokobusuxas.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/wovalu.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/zekum.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/26570540208.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/47219913695.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0f7d558bb1f34773fd88a105af6d0843/37339242131.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/91985550594.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/81cc4e9cf34f4b1388321afd456ef1f3/nidimekumagiligakinise.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9053ccb791---15086894289.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/24266732307.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/97244274191.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/83911529117.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/67081490027.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/58229082942.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xatufabumugazedi.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/tupilerulenatojixuz.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f354c6200e---nuzezax.pdfIn PDF document text
    • https://premiersuli.hu/files/files/71831259749.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2d8f153cf---gilebamutubaxupomegemu.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/90250092600.pdfIn PDF document text
    • https://ubranni.com/uploader/files/20974493253.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/sefile.pdfIn PDF document text
    • http://com123.vn/uploads/file/74858210112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=carrom+pool+striker+hack+appPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C4 17296 bytes
SHA-256: cb27ee25262e1a2e2d7ee442328f8a7bcf15b04496f7c1bbcdbb492b5859bf70
font_02_sfnt_off000146bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BF 16340 bytes
SHA-256: 88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15
font_03_sfnt_off00015cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB7 10660 bytes
SHA-256: 154639fa7f13a95b558f44c702d5b55ef2201bdbc5646c4b6569e5ec828b8e57

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