Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc1de7113940cda…

MALICIOUS

PDF

91.9 KB Created: 2021-06-27 02:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c03077e8f4703963b896fdd5db563ab SHA-1: 45ae7bb25bcc95a378b7e0e817159cabc8c7510c SHA-256: 3bc1de7113940cda782147e66c7ed78748e4a98ed4fbcf05435e94713b33da0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised CMS upload directories, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and numerous external links align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075f676dc6b0---88866415133.pdf In PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0af49e007c4c0a13ad2dc7729205fa92/60989913405.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4aba899749c27e83a76eef455895357a/wilirixowopodatifeguwatik.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f2f7b0ec---godeje.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4ed5a82a46e9f2c70abef4a3cc626a67/88154491125.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d1d371722f6b9d3a5ecbbbcc70b9ae9f/86894465174.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad56df829db---vetas.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b797c0df24---54740143314.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1e885da7200393997989af1918a145f3/begamaponizopepejogub.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/48521011801.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609776d3f3f7a---diwetumeteta.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/34adac3903c7cc3ddc14810598426f2d/39577220467.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074c696b83de---70529210918.pdfIn PDF document text
    • http://ozari-ua.com/files/file/76035932087.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073877b967cc---68876520526.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbac62f6bf---14713177774.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/xeneligumevos.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8fe3d6ba7---turabosigupadarulabukap.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4002e97b8---74646944617.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wonigog.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/q7bicir7rloh2ti14rume5aqe1/7794639858.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/34207909771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=multiplication+and+the+distributive+propertyPDF 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_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 18444 bytes
SHA-256: acda478e2bc3f71188aea62b44accc2b0c74020e34ea6266f41e2a1e2d4297d4
font_01_sfnt_off000130ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AD 11024 bytes
SHA-256: ed29ba3c93d78788969eee632796f5c528b92c838712280dcb41299d6ce62291
font_02_sfnt_off00014a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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