Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fdebd09db8ad52…

MALICIOUS

PDF

88.7 KB Created: 2021-07-03 01:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0bf2b6d5a824e8d899f5f0a45e8f52d8 SHA-1: aa3d35dd13726aa6680592f29d00400458dde8e3 SHA-256: 85fdebd09db8ad5293874dac1ea97ea142fc6b79e7287efeb25e6fed121d35cc
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution scheme. The PDF structure suggests it's a link farm designed to redirect users, likely exploiting vulnerabilities or serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://medvor.ru/uplcv?utm_term=civil+society+in+the+philippines+pdf PDF link annotation
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6bc93fcdb---jipita.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/46049956974.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/21358758452.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cff2d769c---80646684509.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/wotuzulo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c7cddab1993912784fee015a9ddd919b/zewezunesixomal.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab8796bb0---botiruxovebimibimov.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/koxegedijobebotefutemobef.pdfIn PDF document text
    • http://digifast.cz/userfiles/punusavanevilibeki.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806e4d5a22c---89861646638.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/zapevowi.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/17ft898csqrmof1lg5cna10122/kivarugubopebuvinejivuwam.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/bivmkdhp0n0s83sacg4vph7bi5/92583118384.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/kavofidunamoketeperul.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/nedaw.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/nifisudupujaxi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a6e3a5d8e619cef808a3eae493cb2876/xuxuvanira.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/25433023559.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/40947375386.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/01e46db2d1069dab8a617cf538578d7c/40341768593.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/95878086236.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a3e526909029c1ddf3eac29d8696264e/dukixiso.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_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 10664 bytes
SHA-256: 40b55fb5fbfe6356eb8bd1bd50e7fc80648ca7e09ad65b70a30293382a820b76
font_02_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 18048 bytes
SHA-256: 3829ba7ebd8029bee55016ff84c75868183282316629c94c6174b88706cb41bc

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