Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f5a5ea436e2906…

MALICIOUS

PDF

77.7 KB Created: 2021-09-05 07:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60f503fa9845b782552556fad5c37103 SHA-1: 33f55f46eb7ccd64a2a3bba2c92e60c59165557f SHA-256: a9f5a5ea436e2906a8d723755224b34e5ba4ff2f8877b2db22db42c9d384ee28
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, designed to redirect users to phishing or scam content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=blood+type+o+diet+food+list+pdf PDF link annotation
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/2cec565ab7eed26526dd35f90e7c493b/zogejulixefowemozeve.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/60863052887.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99adea086---2854935658.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/71058397451.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/488396eae5315adfc640cf4691a141e9/53162459038.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/88116f164f8edab942bb7764114c222a/nisuwivub.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/filimonizebe.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/lm1hhp7utmttgl0lgctud1us1g/pozogigivijofedejidonax.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/godavuxetef.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/73246821506.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/18002059932.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/gemakijekiwonef.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/38462867099.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/28636209547.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607783e2ede8e---69071095208.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/21q22eks1evvi4iavvrncv7ph3/xibumifol.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/fovitezuzurodewevi.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105240223569565.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/24681681228.pdfIn PDF document text
    • https://istanajp.com/contents/files/12562267245.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bf4ed5e6bf2291295a712326d750a2fa/59839053813.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/boloreru.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a6e8666da52f539355b04932c5fb484d/werodinatutilomukizivu.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_off0000cbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBB 17600 bytes
SHA-256: 3b66787c648c83ca428314ddc970d365f6752e8e4b6dc36a8e8b264e24faa74a
font_01_sfnt_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 10292 bytes
SHA-256: 357afe67fdf4701a4c0858dda3b8b27b14a4eecb1c059c1aac9b81cfaa5ed08c
font_02_sfnt_off000110ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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