Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee5c9605a52f886…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 19:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e60997c460af4480cdc11f587b120a20 SHA-1: 2d9e77ed850b4c1910c7c15adbf6c3a0caf2226b SHA-256: 3ee5c9605a52f886147b1db28fdb1e92e945337fe85f96183cd98e88b0810887
204 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'SE_SECURITY_BYPASS' indicates the document likely instructs the user to disable security software, a common tactic for malware delivery. While no scripts were extracted, the overall structure and heuristics point towards an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://stellarp.com/userfiles/files/63532885862.pdf In PDF document text
    • http://caydinhlang.net/userfiles/image/file/ribobodovowazonenukora.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7c88c28b9305239d74765819b28bf4ea/87876007450.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/delejimimaxi.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/meninevonanurifaga.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/658e85d5151e2d1b6a01507c72201515/bexenuwapapowap.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/69133206129.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/19596131952.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/kigotulosadejid.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a281fd3a3d---vamanofipelixu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e375f30a---84288939943.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/65083180448.pdfIn PDF document text
    • http://africareview.in/userfiles/file/polomolosalasijini.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/65666169107.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d70e4e280f6---14057372811.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/6d71d5cd4e1936bfa91a6e002175c059/fawevu.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/fec23e9f3c19e247db3c4c56487b3771/rowukelezavefobesi.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160738a2d65921---92184385788.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/2d3b62b126cd02f8919cbdee8045c68a/napizufixotul.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/xovukogunexedez.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cba97e98825---netibamax.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160705e7b8d485---44360584467.pdfIn PDF document text
    • http://autovoda.ru/upload/files/lodanilozilebujivi.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f75fa34b9f---lozamezojamatalaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=who+wants+to+be+a+millionaire+special+editions+downloadPDF 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_off0000dec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 10996 bytes
SHA-256: 4bd8c3c258f8ada5e9d1987fd792e043c58cb54b721d9bc9e85a17883b4e9299
font_01_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11001 18956 bytes
SHA-256: 0aab334068b48b1ede5e7f53e1cf8a3fe00db4f1eef593d2fc0914a093aa5c46

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