Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba769f1f927dc03…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 04:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 097a9f144af33e2afe95d850ef7c8c8c SHA-1: 8fb1312d7fb7b564d32eb6269f7fea5914977dbe SHA-256: 9ba769f1f927dc03d0b11b8004ce8e9bbde19b7802dc97a940b8ed93e6fb3161
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various domains, one of which is hosted on compromised WordPress infrastructure. The 'SE_MFA_LURE' heuristic strongly suggests the document's purpose is to harvest credentials by mimicking multi-factor authentication prompts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://nomylo.ru/uplcv?utm_term=dotpad+tablet+hard+reset PDF link annotation
    • http://oresteruggiero.com/userfiles/files/53650491673.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/jejaboxeve.pdfIn PDF document text
    • http://chinalabware.es/d/files/diwenulamixesozig.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/17396412675.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/roturitepasovaz.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613408d77e2e0---dosuteluxizeju.pdfIn PDF document text
    • https://granitnet.hu/editor_up/52335188129.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d180850381---subixowiragikanokafusata.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/jijilekisabijedaxadogoko.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/noveniware.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/87196181629.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/riguvewopixi.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/koposuwatofo.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/23661820343.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/90036371254.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/xusokuzipixubariboretap.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/petelug.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/pb80tna8qs9f08vhk0548bnldo/reriloxifarefizivoja.pdfIn PDF document text
    • http://goldmustang.com/files/files/leveleresawoj.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/20d9f65820629a599ed4a114b2e77a06/79655450864.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/12567145735.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c474c3552e---5439393750.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613519e94bdb9---82911903042.pdfIn PDF document text
    • https://aildf.in/userfiles/file/nidaxetesutonaror.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_off0000d3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 10436 bytes
SHA-256: 489510aa6ee7a490a9a929de6c06077bdd0f145334193976f11d5994277b6a44
font_02_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 17456 bytes
SHA-256: f57c0146547084a7b15106a37194fb419981bed662e87d87dae7d2c185ce30b0

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