Malicious PDF — malware analysis report

Static analysis result for SHA-256 0930b8f274ed9a85…

MALICIOUS

PDF

94.8 KB Created: 2021-09-04 13:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f525d42cebe5d15cc5099e259476afd SHA-1: a98b48b2c4a4ce3a8594f909e6ac7965871319e9 SHA-256: 0930b8f274ed9a85cda0af08d4761c49937c279bf2e04849e52f96f224305478
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 a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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 http://refinerlink.com/userfiles/file/37019545872.pdf In PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1a04ac562072897a33ac537323695b47/fuladam.pdfIn PDF document text
    • http://servmed.net/userfiles/file/tatep.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae71ed719b---salasiza.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160adca991bbcb---pewamolovatosumixogufuk.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/34019723505.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607065b4455d8---wuriwaxadujowotovusigubim.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/rulujesumuvedusolonagidis.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609662c383c22---41573531701.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/zonutaxetibim.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/28/file/gumijide.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/wogim.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/d78569be1b0ff6a138d2d809ce396949/fojir.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/21923ca54ae40ae81979ce68138912a4/lepufo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a631c71b1ff---84909831463.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2621de8a97dd46a346979f417ed4aaf5/wiluzukapoluj.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1612cc8090de26---zijerumofipil.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4013ab5c8d97f2c18d03484527b0d906/4535387109.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/tapotevugosufuzo.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/papirududuguwoja.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/rusep.pdfIn PDF document text
    • https://btegypt.com/file/87831889042.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160accf8ad2eda---vojulidumixemifelux.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a5a24148bb2cc0e88a0a8d7f9ad58039/nibidegezolaxevorumewetor.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/fikozuvazujuva.pdfIn PDF document text
    • http://simonide.org/userfiles/file/50950486815.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/4842916374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=citalopram+efectos+adversos+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 18072 bytes
SHA-256: eef1835c692b733780ba8ec0f974d4a8e1810d63020214ffe729a35878532929
font_02_sfnt_off0001545b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1545B 10772 bytes
SHA-256: 0a9caf9f618c6c6682c6c83f742f90fd3b85fa9a3caa60c8e4f286312e700e92

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