Malicious PDF — malware analysis report

Static analysis result for SHA-256 81328aae147c3b19…

MALICIOUS

PDF

84.9 KB Created: 2021-06-27 18:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b3f645d9f80e536e06624ee963b8d3df SHA-1: e07d7f33571ed4d5fff70b0eb40bfa332da2cea5 SHA-256: 81328aae147c3b19e1d0bd7c9756ab02a2af39a37e95ff69b0109062380f67a7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are likely used to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://garglob.ru/uplcv?utm_term=bible+verses+about+the+trinity+in+the+old+testament PDF link annotation
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/58fbfc7469512fdb2e7f773540195f06/92371987604.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/73c2c52c04eddb064ba36b63d3d0b5be/91291512568.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cf2f1cb0f5c2e442845eda60670add7c/37163951056.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817ea69bc9c---lufomirotimekezarogatub.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/gejomozofa.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/fitejemibinopomapolego.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/wopuzujuluwofodemonadone.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a954f486ae4---6166383307.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/jevadamurepozawebamu.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/91502658116.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/fegekojunezagodu.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/velagesawemisamivetela.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7710a1527b---5923691547.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/wadixokulonefewinukaben.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074d3ff2a918---kuninateze.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/70463914955.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea800c1476---fafilakedifovumomitukipo.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/91442469747.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081110d5bd97---zuvusomajalevazelo.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/rurejev.pdfIn PDF document text
    • 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_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 10984 bytes
SHA-256: 346642384f6d6b54714d4eb190de1943822535c293853327cf2e3da628d20fc0
font_01_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 16988 bytes
SHA-256: f60ccc49fa51291b3f131488f794f39b314db5614ba23c97e0c1fceddc0067b8
font_02_sfnt_off00012dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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