Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ccb759a92d93f6…

MALICIOUS

PDF

76.2 KB Created: 2021-09-01 09:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 086316d55fb59dcdf8c3d4822be87675 SHA-1: 093181f235925fd19bcaa28f0d4a9bcc83df6ccb SHA-256: 75ccb759a92d93f62cc60f104879d1451a2beef054b56bbe43d04fd52968c542
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or associated with compromised content management systems. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to lure users to phishing sites or download further malicious content. The presence of link farm heuristics further supports the attack pattern of using the PDF as a deceptive gateway.

Machine Learning

  • Nyx PDF Classifier clean score 0.2431

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=mastery+learning+strategy PDF link annotation
    • http://bjjiffy.com/upload/maletakojiximesonad.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/rozopexatojogof.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079cab13b284---24067436694.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/fikitomabutukemo.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/92412125433.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16100b9b5a9936---nagovafilupisaxifigozug.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/72948348645.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f4d50fe0a---80097622196.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/peruxodisivafipobaxebe.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9e79224da---wipofagemomamutoxaxiger.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e00ba7aed4---6746513080.pdfIn PDF document text
    • https://teamcode.net/upload/files/nekarix.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16110d63998773---pimadosebupepemu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/05a1a9768ff8a152ccfad2469e9555f6/xisulop.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/degamobepefotutiwa.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f01a27a9df1ff7eef5f389adde20e19c/joweluwaxen.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1bbee4551e37000ff3234aa32e964f38/79460792593.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0107868b2---18198247301.pdfIn PDF document text
    • https://isleo.com/i_photos/file/17266121159.pdfIn PDF document text
    • https://network-italia.it/file/46434743121.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/depewegusor.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/43802148579.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5fd572f9d---lunapipi.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/bb85af4db78b3941b02b20bb4285d261/vonufazivi.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/midutazifuribezefezonajuw.pdfIn 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_off0000cda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 18452 bytes
SHA-256: 53304f804ea2735fc514ac265a2ddb932a8d2d627eb18d913fd6b3b28a127efe
font_02_sfnt_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 10268 bytes
SHA-256: 58f721bf3769296066e46f634018221a5b19e8a72f35aa4ace5c55b4a1137b00