Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fb4d56e2613f6d…

MALICIOUS

PDF

70.4 KB Created: 2021-09-07 20:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1ea095737bc0d572dc07856c7cd0246 SHA-1: b82a11674275126023ffcf28e12419d30352a563 SHA-256: 79fb4d56e2613f6df3e7fa9771fe54250360253190d8fdc5ada94d19569f3914
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm, combined with the use of 'utm_term' parameters, points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=approach+to+microcephaly+pdf
    • https://termoformat.md/img/files/80224713660.pdf
    • https://jaiminsales.com/ckfinder/userfiles/files/31188279860.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c473e19c3f5---pelago.pdf
    • http://shuswapladystriders.ca/userfiles/file/30708248723.pdf
    • http://ned.ru/uploads/files/tibagofinipidevupasalo.pdf
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/20713638949.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb2aa3f5a3---xijumisoluveto.pdf
    • https://taxforce.nl/userfiles/files/39184503595.pdf
    • http://viettelhaiphong.me/data/dulieu/files/wexukumexibe.pdf
    • http://hyunshin.net/userfiles/file/98712664863.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608168f0e7df9---16018599003.pdf
    • http://eca.or.th/ckfinder/userfiles/files/62097441538.pdf
    • http://www.elstar.ru/uploads/files/34351233683.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b902b68452c---1270170738.pdf
    • http://elpijisystem.com/file/piwexinugasoxozesunopa.pdf
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/munesosubolu.pdf
    • http://sicilyontable.it/userfiles/files/96342830359.pdf
    • http://beta-rc.com/upload/files/lopokawo.pdf
    • http://griswoldremgmt.com/uploads/files/35918719517.pdf
    • http://bassbasement.org/userfiles/file/87542366958.pdf
    • http://alrehabourhome.com/userfiles/files/80630156375.pdf
    • http://bocghebinhduong.com/media/ftp/file/fedonerebiwebegemug.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b69e.bin
b1682d679476d3ba13ef08ee73c424fecd33e5eaf83db8babd4cec9e5dd08df6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB69E 14484 bytes
font_01_sfnt_off0000db47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 16792 bytes
font_02_sfnt_off0000f35e.bin
a60417ef6576b826146a0b8749203e1e8248492806edc01b65f1ee7f30584374		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 10708 bytes

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