Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fef03b4ddf2c67…

MALICIOUS

PDF

79.8 KB Created: 2021-07-23 12:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 624e6ee5516eb732c205cf744b34b8e5 SHA-1: dd4ed4bd0c9834b5ffe7894163e47b348b21fae4 SHA-256: 71fef03b4ddf2c67c13fbd01f6e80fbc2818ab50b81d14617f560e4096931a71
156 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/vjtouto9oeqa4t3g40d4eg8i1r/90504159059.pdf In PDF document text
    • https://alyosserspneed.com/userfiles/files/vufupimimitoforopeperodij.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc35c0d6f---7631559555.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcd5d90155---48198040458.pdfIn PDF document text
    • http://policylic.com/uploads/files/98327393495.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/830f6f798c08ee61c99d736a9fecb13d/20369685158.pdfIn PDF document text
    • https://guijek.com/userfiles/file/53857549957.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac10e9246---rewenuvuvagupakoxu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dd5ee985541---sugedum.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d268b200c08---11407392746.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/73721420374.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/46864750870.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/rf9rrm849dkrl57qpiddccl3n7/32303094280.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/roluxatidabekadedibaru.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/tfjb00bl0iur9uovolaq7apq13/64815317828.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5fb2f634072e0a52d2eeb947a780c0f0/buzete.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde6e46043---moniforepigopabalapaze.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/vuzapoxolozugeno.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/72741169732.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/nugitogimid.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b184b44f3---76184097696.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/60eb461ffd55f78c7d346dff3a250799/zovana.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/68411038756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=soft+s2+in+aortic+stenosisPDF 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_off0000d8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 15564 bytes
SHA-256: 6fa72dcbe35fd8ef22cad7566e1853dfe6c1dd64bff5ac154a4c3ffba0ec0f04
font_01_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 10480 bytes
SHA-256: e27c87871de7755c1ad67db46ef8caa4006a2031298a670f150548017d90d41f