Malicious PDF — malware analysis report

Static analysis result for SHA-256 2936bc1ad3d37e5f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 03:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40172ff4e4e9b9376150ec4d1059ef7b SHA-1: 499c6f0dc7098eda712d4d267e9a929a187d2c16 SHA-256: 2936bc1ad3d37e5ffefcb73ec17f5e02b67ac3247c1b55dd2a0f67fc57f781c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous links to potentially compromised WordPress sites, suggesting it is part of a link farm designed to distribute malicious files. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely using a spearphishing attachment as the initial vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073be91e5f19---jipesijixewujogitavuxu.pdf In PDF document text
    • http://cjatkinson.com/userimages/kolewiv.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/90491500046.pdfIn PDF document text
    • http://namngonviet.com/user-/files/31225768634.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a702524ca11dafc28ee412363607244b/87333961279.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/78955313144.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/nedazipuwifipavusa.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/ccdd03960a72a732cc3f318d4ee9d528/38563300774.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ac01e14d6---26359407585.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/1da7cf431c5100a5762469eab500b8e1/62628318820.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870a9fe122c---famake.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/41492222491.pdfIn PDF document text
    • http://normel.org/files/upload/file/5881961965.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098454d82b20---besojunuv.pdfIn PDF document text
    • https://adikkedua.com/contents//files/60732009644.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/lorixosi.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/18p69n6p6lckd6g16kmclruhu2/13337637162.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/31954748006.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/40235930647.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/20da3a7c0d8eee1479d04de2d6ed1338/76479259122.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/6218281750.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/livanigoxanapepefoger.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611f424fe2e08---35039374712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=neft+form+download+axis+bank+pdfPDF 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_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 18508 bytes
SHA-256: 152c0b8c7d72fb89c6cad7dc20be190a44836765234be385362541449808c604
font_01_sfnt_off00010adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F6 11056 bytes
SHA-256: 0ea46fa2214643affe9815aee24300186d2ae426e23e972af881fc0b8e7dad19

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