Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f38fac947daf912…

MALICIOUS

PDF

94.7 KB Created: 2021-09-20 13:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86b7048753139e3f33eb0c9883e089b3 SHA-1: 72c828615e46f123aa2dc3b9de0a018f66842221 SHA-256: 7f38fac947daf912a21f71c298abbb6609db21c2c9fb7add5ec923b295885e3b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories or disposable hosting. The primary purpose appears to be redirecting users through a series of links, likely to a phishing page or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://tpk-m.ru/files/file/gumenokuzajujovadijiriwe.pdf In PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc567d9773---mumagatipine.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210913_220233.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/60948992232.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/wepamedifubepa.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/lidugubejolokokesumalav.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/87246397600.pdfIn PDF document text
    • http://nensi.si/upload/file/9075918777.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/74899436993.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/87048326927.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614283cab7289---37067338588.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210906055056.pdfIn PDF document text
    • http://lyshiying.com/d/files/39788016668.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/30168962482.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/844511904741631337350.pdfIn PDF document text
    • https://kapefashion.com/files/files/61259825201.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/9daf2ff5ffeed8d6e6fd1957f77d2a8c/25976976107.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/40468671542.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/xesukimigamafa.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/4357616060.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/mulus.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/42431675860.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/63916958841.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/40001281538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=in+time+watch+online+with+english+subtitlesPDF 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_off00010911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12128 10856 bytes
SHA-256: b21f135d7d54d5cd5b4fe21ba8201e099de90dcfb7b2a82f777f3bb01a32d38f
font_02_sfnt_off00013a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1B 19344 bytes
SHA-256: 41a52ae177cf56dac395e40214b5dd825cfb7691185249c67062fc8547400c47

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