Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c081b97ed0fbdb2…

MALICIOUS

PDF

84.6 KB Created: 2021-06-30 23:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62da5f2cf71678657e446a5dcde31197 SHA-1: 5dc509534019bc2e7310962f5d85ceb5fc8f0541 SHA-256: 8c081b97ed0fbdb246023c93263d8610e20850fbbf04a3d75ba73685c2f8343a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or SEO poisoning tactic. While no scripts were directly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/16lbjt9vas0ifk4c1vgvbrkose/9512422751.pdf
    • http://modern-pro.ru/files/file/dojenugigizavivipidosowi.pdf
    • http://capmar.eu/userfiles/file/pemujurobususine.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f8fe972812b7811851446d2057634ed5/dedavojezoripezanumavixil.pdf
    • http://eia-edu.com/userfiles/file/bifegelo.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/12064627500.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3e0fd48eb2582437eb223584fcb58056/raxapegusuriliruzabikaz.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acbb929e3cb---43969540880.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607981377a7a8---jezis.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/dd5f0dbd7c4c29df575253f1acd8d299/66970824607.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ead32973a3---mopodexinuxitoxagom.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6f01dca3113b137be6ce7f03ba8553df/65339566698.pdf
    • http://poorclarescork.ie/images/tumoboruz.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/50vfmsibfp9d31i4dh3qoqh1bf/pikemolazupunu.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/sipogadinutimemunoweroge.pdf
    • http://mamtomchabahai.com/uploads/files/files/terokegesovebepexi.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073755e1b327---21844735170.pdf
    • https://walkandsmile.com/userfiles/file/janegerepivude.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e073dc32d---pofolatotufujavivuza.pdf
    • https://hijaulumut.com/contents//files/17532326627.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e6da043e22f49203e5acc9d7af0bd88f/55923124750.pdf
    • https://iwnta.com/userfiles/file/zosas.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abb0b9ab260---lujebukidabinabo.pdf
    • http://jnnycc.org/userfiles/file/81216387004.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607919a04df9a---mulavisiralarodemu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=calculate+your+iq+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81e.bin
78678f5cdc33d2e363a6c6ce28195f919798f8f6dde355efd092edf43cd63514
pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 17036 bytes
font_01_sfnt_off000114c6.bin
ae67ccc0971ac182e5d27bb3afb3e489272e7606ddf47395f9640d95a76a2b29
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 10552 bytes
font_02_sfnt_off00012d05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D05 16792 bytes