Malicious PDF — malware analysis report

Static analysis result for SHA-256 656d6eee55703da5…

MALICIOUS

PDF

76.1 KB Created: 2021-07-03 00:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0ebb00dc0e2cd720a4cac4d1ddbf22d5 SHA-1: a5f0b808d923145c71a811d048e4e2cfada84049 SHA-256: 656d6eee55703da5293c47dc33ea59a5ffea10d3c734cf1eac8bc4102a687c28
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1b21bb3572e01aad804387f4f6944940/xaluxuwawa.pdf In PDF document text
    • http://remont-etalon.ru/upload/files/tawojojozoromodadelaw.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071197721ee9---20536886665.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f360be4536---vanovesinelod.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/bokax.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081059c7cba2---98756533886.pdfIn PDF document text
    • http://prestopc.it/upload/file/94502613182.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608816f588e55---rivujipolixuvexajekewu.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b3f4719ccdcf5ef20e0a81dae6efc98a/43859226009.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/fexupebuku.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/32747486165.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/temuzuxexojute.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be383b56c0f---pavagemuzufamidubibokisu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a5a181ed9d8b584e63b161f2e827771e/98498754120.pdfIn PDF document text
    • http://vswet.ru/f/92380526886.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/sikirufokobovogubuw.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/70971403410.pdfIn PDF document text
    • http://flgr.ru/files/files/wivinuzu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894463b50a2---rupidaxezuwedesaxebasax.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3d54affc12e088a9e4433774a9d10cf/42409032087.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/85026117874.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/xatusopok.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/39304014271.pdfIn PDF document text
    • http://k1a.ru/images/files/file/gujizazorife.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160822e514e5a5---nabopatiweg.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/pisezolupewulesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+penthouses+123PDF 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_off0000c3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CD 10356 bytes
SHA-256: b328d60f316a33a929e5e88e3d35b31b996fa8d9280dc44ddec8a1570e8b6890
font_01_sfnt_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 18252 bytes
SHA-256: b967bdba984a8915b3b5ba4fcc1e798b6472d1c582e35274da0df8661bce61fb
font_02_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1