Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3004c688288b09…

MALICIOUS

PDF

69.7 KB Created: 2021-10-03 18:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db9ea7c33fc62ac547d8fbe6038272ee SHA-1: 87d25f59597ad3de2429eda41b0cbf4087786946 SHA-256: 0f3004c688288b093eefa9599fd31f4b1d98da25b62e8a43dcac3d0f1b752ce7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=11+year+old+molars PDF link annotation
    • http://yasairamenbar.com/uploads/files/ximutevinokelo.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/dojoxiz.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc21eabd36---regoxomirozumukasib.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/91839469996.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/gusupum.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c4d0bed27---28033559221.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109040406134957.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/621194894.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/97347311970.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/bijokoxisevipi.pdfIn PDF document text
    • https://citronel.com/userfiles/files/1562404232.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/nomaxebonogoroxo.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/wafulebirudasanovado.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/zujitiselurab.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/23113511298.pdfIn PDF document text
    • http://rld-carbon.ru/file/fiderorafutagu.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/kiwimuxesolewodoz.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161403dc193b83---fopelodez.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131758eaac09---jajepeporulawizol.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144914f4aa91---zofiger.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/suxowoxixoxixekuwuwabik.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/viselazijinixobag.pdfIn PDF document text
    • https://777mto.info/contents/files/76239862042.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_off0000b215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB215 15976 bytes
SHA-256: 627e3c604ebd097580053bf4e5e8b48bc3130e65ff840206a95f12f67b308881
font_01_sfnt_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 10184 bytes
SHA-256: 558c6a2f62afff20198cb19027e0aecaa9bc08a25264e5f1cfe25452bbd9e84c
font_02_sfnt_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1