Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2cdff41a8fb41ac…

MALICIOUS

PDF

89.6 KB Created: 2021-08-08 13:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60ddc1b2c495e414e222563d63124043 SHA-1: 141f5794144c7d50161f46abde25341a6cc63c3a SHA-256: a2cdff41a8fb41ac4da825d08dcf8c408388270812a5c9287106e0dc671c4f6b
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of embedded JavaScript, combined with the external links, indicates the document is likely attempting to exploit vulnerabilities or trick users into visiting harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+do+you+find+the+perimeter+of+complex+figures PDF link annotation
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7fc938fa9af926b9146878f6e8d6f40/xewameso.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7d36924d19d4623f30f64ea748d200f9/dinuxaxudaduvuf.pdfIn PDF document text
    • http://yuhongzg.com/d/files/zotifoxovotemegojekuk.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7bgnkobgehsor5srfevhk29936/62236587343.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf6780816---41412102287.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/sejup.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/13841682346.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/25343732838.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210720_3AB246E195AFAC1B.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/digepeju.pdfIn PDF document text
    • https://vestol.bg/files/file/binalogux.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/vezomotosavesi.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97f28d2169---10552701796.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/gojutalejaz.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a4684f811c52e08c12ed74d34d315e98/51434647868.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210620143804957103wgi434.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mitlm97qikbnmm4m5bgjcs24ph/pefomafebiruka.pdfIn PDF document text
    • http://grotech.in/userfiles/file/pakezesaf.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d936059919---gutevisudizof.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8937aa43---20799501255.pdfIn PDF document text
    • https://ultralloy.net/upload/files/32113915834.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/94537501287.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/zorati.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16073c959a568d---7942460911.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/70fc10b16c12c0ef51690000eccd4b29/41174769455.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_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 17632 bytes
SHA-256: 33f11010df170ec14e365191bdd5bbbf1dcad3e9e0c8e94dcd97c60e87eed6cf
font_01_sfnt_off0001252b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D42 11300 bytes
SHA-256: 0709ce0c14b0dd8a449a557144a63382daa465b4395f865823d5021ade7f6e4e

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