Malicious PDF — malware analysis report

Static analysis result for SHA-256 6263c289c38e784f…

MALICIOUS

PDF

93.5 KB Created: 2021-09-06 03:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44950ee1ff3daf56b25a1395c6977016 SHA-1: 24b0288cb97a58453a84c37ffddfcfc3987e4eb4 SHA-256: 6263c289c38e784fe8ea7f44c74d1d8a6ce1880b7eb839d0840e7cfb88e6367d
156 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=otitis+media+akut+jurnal+pdf PDF link annotation
    • http://rogo-rotterdam.nl/files/44457058905.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/5715aa907a506e160af615388e34aa1b/22098367986.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/38486055430.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/53fkgp8l72br1tp9u9uu1n0io7/67487673480.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d68528e3acb---85972234905.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/0d2342a61cfa582c3157951d905d87f3/depelajabipuroxasewotap.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7eb2735ec1f98184003c580814cb0357/5953001527.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/75b7e7c1cb96ef3db4e3ae16362388cd/kepepeja.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3578ou7rsri45hjq8t9j85nt36/zupupidifumazijasodiv.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/vovovuwegebezovuz.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/c2aca4237bb72dd516d0f5027f7b914e/56167538492.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/35024272257.pdfIn PDF document text
    • http://holzbau-napetschnig.at/44589886958.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a34eb7005a81e57d7ad1fcbc7cb9781c/18053314581.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/dusemidubifip.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/def877ddd43be4145fe50d015a8b28c8/12275396010.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/78rvih220s3i7li6sujg3rueq7/zodeta.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/bekadakebegifemo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc88b41e7---54452404302.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e5b78a640674725bdc9083b6e13f064f/futapef.pdfIn PDF document text
    • http://modern-pro.ru/files/file/58330579018.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/l5ilmvgctvtqoih5k9gq7oc506/mazebafesodosupomajunag.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/4a84febdaf128e4cd2ddcf61539bbb56/19889167388.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_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 18328 bytes
SHA-256: d6d8952a368e110755b2ad8dc922249448bb89a56e0ba4ec8de9b0ca6799951c
font_01_sfnt_off00013725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13725 10888 bytes
SHA-256: 29b5e8d8d5393e10f6524c75cc501bd3a6a65ee97404c2f46b5d1ac31a506efb
font_02_sfnt_off0001504f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1504F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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