Malicious PDF — malware analysis report

Static analysis result for SHA-256 01edff03f3a11903…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 14:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f1894f2a78adf0e3495aaf4c400f6ee SHA-1: fd407645c823aa620729f7e2a1eba82dc3436e33 SHA-256: 01edff03f3a1190365cac75a818aec5daf3fd104e424f6ac39a939d6269b58a1
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external URIs indicate it's likely used as a lure to initiate further compromise, possibly through exploitation or social engineering on the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=membuat+gabungan+file+pdf PDF link annotation
    • http://rebornfair.com/FileData/ckfinder/files/20210809_0461D2AF7C34A6E9.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/jedavifakariwikiwemon.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/vadogarigenuvubexikut.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/zulomigavoxotufuru.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gazitoronobunesikexegawid.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/jafewusik.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/fopekovoj.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093e4711e960---kowafizokaru.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0c6e379ca9466f52dc629c06196f328c/72263266717.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0dca3cdce---65730857301.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/54522555219.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///56988112996.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/gitudufusoxexunoxumaxoxib.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/fidaguzebobibofexebakoke.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/b66d031470851bf40231f2fe35534171/pepeteberoxolud.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/tafukuzarivosejenuwufeku.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/beb1704da774422f4c9232d32401816d/lixutivimenitazoro.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/35826511587.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/37155477655.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/jusupi.pdfIn PDF document text
    • http://susutour.com/userfile/file/3455691513.pdfIn PDF document text
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/18111559970.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81763f3b41---fevokazurovidewubugitakab.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_off0000d8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 16876 bytes
SHA-256: 71f9da29fd05c38ca8930676692c20eb67109d8b52e0b03877f3e5bcd8859c4d
font_02_sfnt_off00011cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDF 10688 bytes
SHA-256: 1a403a2f30a330a19fa0c18e5967d2f640e819d1f547be616b6762561de8bf42

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