Malicious PDF — malware analysis report

Static analysis result for SHA-256 99028b0a7b90516c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 21:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fc35af099ff07c98bac6874d32a26de7 SHA-1: affa7b3deb2c49c91ca8e94884c6350d4665eb98 SHA-256: 99028b0a7b90516ce7710e30f7d9c6369bcf87557ad8d80fb7fec045c7f73e6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm designed to redirect users to potentially malicious sites, likely for phishing or malware distribution. The PDF structure and the nature of the URLs suggest it is part of a phishing campaign, possibly delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://allytemp.ru/uplcv?utm_term=fidelity+watch+online PDF link annotation
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/kaxegoridunekemanozibap.pdfIn PDF document text
    • http://ha-sine.com/d/files/94022742140.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f13ca2ef0a---98107412504.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/rolilunodawanejidonafe.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142e3b672d7b---37015658892.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/danagoviw.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210901170503.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ihde3s4j52tqrl38pg76qvpm9q/77448381649.pdfIn PDF document text
    • http://cascad-trans.ru/files/61671794163.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/nujutipuwexep.pdfIn PDF document text
    • https://qnzar.com/files/12222077141.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/95751161028.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/gunupuminobuzigelu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ivsv46p2alrs7vf0t0bvhv16f8/87672002196.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/losowigir.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca9ccd1a4d---tapuzikaribulama.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/xuvokig.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/bilunejowekeviri.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dff9c439c---dukokafedokinijenozikowa.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/47533636797.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/titotubimibemova.pdfIn PDF document text
    • http://gekon.net/userfiles/file/mizozerilafuzame.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/pelubebama.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/43460308082b2f0d107f05b2b9e97284/xidobakegonelomak.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/jadajolakigejes.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/41019462446.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_off0000d06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06A 10376 bytes
SHA-256: 5c754594079347ff61362a709735822985f1b529be12c34da51e0201eba21216
font_01_sfnt_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 17640 bytes
SHA-256: 231d450c14598de81ce55e510fc714a6ed6024d267d68fb3076475bce3296380
font_02_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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