Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ff4166707fec4e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-14 04:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa1b5a25d60d74b850116b68ea114105 SHA-1: 2ddd25ecd90e2dfddc69bde2890e553ec8b64419 SHA-256: f9ff4166707fec4e05bb4f72e02a3bb6dee85e5d6c8606ca7b5dc70c9cd85a38
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to potentially harmful content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3dc97d79---32426592598.pdf In PDF document text
    • http://squash-fitness.cz/userfiles/file/givuzodazopewikimuxejejaj.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/1058192394.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/vozeser.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/ginuz.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/tarobazulukujutabifavefuj.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/51394419972.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320fc22ed49---xixovilapunus.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/ponategojogejor.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/50654744300.pdfIn PDF document text
    • http://aquaprosmart.com/userfiles/files/65013849000.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/gavufarolarerupepotajag.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/4359424657.pdfIn PDF document text
    • http://standdominica.org/files/files/pijofurudetuduveniv.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/xasuxifejasitopikafegez.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/xusetozuvususafimov.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/79414904027.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/48869686419.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/disolurapadaxokas.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad2d251ab---lorefuxotamutivini.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/lililekewibinetogam.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130823938d68---22517256118.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/50940517359.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4aa8dc3d2e5864b533a0390ab618e0b9/2455741521.pdfIn PDF document text
    • http://praguetransfer.com/files/file/kekebozuxutijogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=stream+legends+of+tomorrowPDF 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_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 20440 bytes
SHA-256: f0579604e226a0ad099e3a9f1c06298e2ef779cf28585c63a2070b0e0d8eb08b
font_01_sfnt_off00011313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11313 10768 bytes
SHA-256: 977074b61956754a1d409fdea6df4f69005cde069d8252c11ad8316196b06c20
font_02_sfnt_off00012bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1