Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c108f2cf5b091cb…

MALICIOUS

PDF

81.0 KB Created: 2021-07-04 19:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a634f17d84e2f929e64a8db0c5dfb9ae SHA-1: 476b6442c5cd64e9573082947321e9a09ba78bfd SHA-256: 4c108f2cf5b091cb1896d59053eff7133eb0ab3136a758371f699b75aa6c7be4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The embedded URLs, while many are benign, contribute to the overall picture of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://communeouchamps.fr/userfiles/file/pibaxilix.pdf
    • https://abe-rdc.com/userfiles/file/gudujivifitosifevazexonop.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700ba08ad9d---luvagabudimeruvovimatelal.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/gisopev.pdf
    • https://mimpi1pusat.com/contents//files/63873564969.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/dc5fa967bffaee8a076077b396891c25/liputokezofedodoworu.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5be33b8a---dokino.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/e77a987a5183729d51cd743f2acc7d56/bapilowovusutowo.pdf
    • https://soalmatematik.com/userfiles/file/sevozizivaze.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0fa01a57e---47955614027.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6bdafb75df12755e908d3db81e862bf/84165204419.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16095e500f32e3---dexenuxi.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f578cfd64---zexixaxa.pdf
    • http://yngc.ru/admin/ckfinder/userfiles/files/58776198343.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16093437cba852---dozajuxem.pdf
    • https://cortopolis.ar/userfiles/file/roxogonot.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e1190c4edd7d5a73dc09c962711ebd10/40293450624.pdf
    • http://jyjwqj.com/uploadfile/file///2021052304442768.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/6974d54410d9eae9010d2afdac714c65/jusutex.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6t0abn32f9cs96ddcgtm3rkte2/22102437315.pdf
    • http://paroissedementon.fr/upload/files/pulatorugepiwide.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/p8hm8focsdimnljpuq69ac1mk2/75642640776.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a3bb211fefed15d7677983ba48ec45c5/30911348929.pdf
    • http://bhhangkhong.com/upload/images/files/lubumaponozosolovirolulox.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/69a27a9a3f8ab1852d5554ec2e0de24b/4644121233.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=blue+and+gold+certificate+template
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 16792 bytes
font_01_sfnt_off0000f237.bin
e0f20c85b5c6c80889f5bc90605c0b88c604108376fb0c6921309a0692236b20
pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 10948 bytes
font_02_sfnt_off00010b4d.bin
a51103ec6393217d14bfadfadcf6da47104b9e8cf18004efbde2bf8f8a8c4e41
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 16576 bytes