Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1790e80f1f107b…

MALICIOUS

PDF

77.8 KB Created: 2021-07-31 00:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79d74d93dee5347cfe3b5fb57e8e2930 SHA-1: 6ddabf471cb8fe575d2b018e37820f2af31f810e SHA-256: cf1790e80f1f107b9a61bbd530974d8829ca6ed6eeeace1275ce52fd1e8947d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://laborke.ru/uplcv?utm_term=okul+%C3%B6ncesi+toplama+i%C5%9Flemi+%C3%A7al%C4%B1%C5%9Fma+sayfas%C4%B1 PDF link annotation
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/mg5rijdddd0qkjj2ibupj2dip7/77614948968.pdfIn PDF document text
    • http://vgkbuilders.com/assets/files/kipifuzezomu.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/79573806995.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b690d4177---vurudezadurosebojetexu.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/16550812438.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210608131758.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/43538688211.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7a0d7a23949c915d327bf983b82a33fa/85726944867.pdfIn PDF document text
    • https://eubeer.vn/uploads/files/jojekuxarew.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/441675245a78a4254052cfca8c8e7781/xewagowog.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/46362168584.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/13995223651.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13938370418.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/49236575947.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/odvtng32c2m16resrbanrif0qt/21369801064.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/90d31800fcf08638c743d50454a8260f/nosazenivuxutes.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/62270837582.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/26696297820.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/sobimes.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e057a14bc---puluwugoje.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/aaaac9733b43172369e9847723b6d466/bakogojozezijaxigek.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/346db5c66c3cbdbf4f67a6e1b6b0dd11/gokojep.pdfIn PDF document text
    • https://kamedia.vn/data/file/93081122110.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_off0000c6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CB 18328 bytes
SHA-256: 1f817dd05091934796497f392d15a8e8abc8e5f3256c8eb3ed965b9946b580ff
font_01_sfnt_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B31 11572 bytes
SHA-256: 721e8e41249017ef98c664ec13f80ae90df253f748a883c9827455de5ab0e9f3

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