Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06c260f77f18280…

MALICIOUS

PDF

74.1 KB Created: 2021-08-13 16:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0371f7e3399aadbd5d834cb01c832909 SHA-1: 6dfe3e7faac3988fa6bf5ba82307a67882a72d38 SHA-256: c06c260f77f182809d1fd914214e5c3ce00aa2ec735ef6db3e4036ab865708f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely exploiting the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b0d0b254e---54086258529.pdf In PDF document text
    • http://netdepphunu.vn/images/userfiles/file/papokagadununap.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a83a3a4ae84---zudagusumogurugoluzo.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/70d309e0bfb0cb24571840e5d2342366/47129349302.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6085d7301---7425892915.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/muxesunaverufexifuvowen.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822ce28854d---bujogafezobapiz.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/jelogawo.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/widumerozutorolopaxewiw.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd79caf2f---doferizexozusirelemixuva.pdfIn PDF document text
    • https://agermag.ro/mm/file/28950878431.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/posiworo.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/tivonajikuxudajax.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/vitepido.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/632c5ce8033fdcda640871706e7074ac/zavat.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/pibawubininoxafirasunen.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c6969f7f0e24444eba3127c4b7d128af/pagudetudutajafo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/8ca4af31a2a53232008b17fa74308b43/32818757841.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/pgm22lldqhdbiiisgmd6t6ecp3/21426540059.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/75b1f859117b23ba2f95d5626470ef52/famusawavusunopufed.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16075b25e8152c---17239995867.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6136e5fb43---zobuxonadegorudu.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/07cbc71821bee641d992e842bb970c88/juwuramaxuxudebizuxu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a25dbdad5a8---22764894698.pdfIn PDF document text
    • http://matras-devison.com/upload/file/dulamolejoxotosasara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pearson+edexcel+gcse+baseline+test+b+%281%29+answersPDF 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_off0000bfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDB 15784 bytes
SHA-256: 58b0eb963791d412c14e652c48245c8d8ed2619e4d93b882f4aea21bd05a9132
font_01_sfnt_off0000e84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 11080 bytes
SHA-256: 75a0e2991c81791b09a277cfc5ce8a5c42b6cf205925f1742f9519009f36ccdb

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