Malicious PDF — malware analysis report

Static analysis result for SHA-256 821ca6f259bbe6ad…

MALICIOUS

PDF

85.5 KB Created: 2021-08-15 19:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: becdfbf63e5aa432cbfadeb552737203 SHA-1: 34b40622cc49b1d9ff219bc9a26f3e6bc18e81aa SHA-256: 821ca6f259bbe6adb664321f3afb8b7b5f5cb1b0f3ee6437dcf6f6988e3b59cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to a variety of websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI and link farm heuristics confirms the file's function as a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=siapportal.imss.gob.mx+biometrico%2Facceso%2Fweb%2Fwfr+acceso+usuario.aspx PDF link annotation
    • http://koreadramatour.com/FileData/ckfinder/files/20210707_297709ED5FB746D3.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/bfde4ac4732d533e924baef80deccace/jibiten.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/zuruxiwufukuvo.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901582622a7---mokasajetune.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/tegesiz.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/47150192971.pdfIn PDF document text
    • http://poaglasses.com/uploads//files/202108110350597273.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/94402764757.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ba339588329---nijuxiki.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/92295355686.pdfIn PDF document text
    • http://princeverma.in/uploads/files/funesazagiboxume.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ituqamqgrffnrstfvka5uku8hs/jinorikixenasakitexa.pdfIn PDF document text
    • http://spharma.ua/files/file/wusiwurufowabezopejizem.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/79431850737.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/zojaj.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/10031f31f8d3b686f2ca0215335e3704/libodamirafirul.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160869e30acb1c---gigeraw.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a52164162e0---13042245138.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c5e187042f7856a7f7ec3605a2c6991c/54401259743.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/54341631611.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/10038080791.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/33237954844.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_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 11324 bytes
SHA-256: a1054dd6e8026e413ec04f23be03b7470c46b75d979a6f0c01259e3028020ad9
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 17284 bytes
SHA-256: 8269070ff31f504673837d68b404292176df192a0ae54d49fd411a00baa44217
font_02_sfnt_off00012ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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