Malicious PDF — malware analysis report

Static analysis result for SHA-256 a006b5a6093e512d…

MALICIOUS

PDF

81.5 KB Created: 2021-08-27 19:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78331a5a98ce866ee1b163d3603b9a1a SHA-1: 38d6cd1ff63c9809fb3d8cfd20736ffffeed66e2 SHA-256: a006b5a6093e512d466924a67a4d5a88952efcd856373e72c717195b2acbe794
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs and link farm heuristics points to an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://wastran.ru/uplcv?utm_term=blake+lively+body+measurements
    • http://dijladentalcenter-qa.com/userfiles/file/tofuvenaferus.pdf
    • http://davcpundri.com/css/file/39795855344.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665da350af---72534720672.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/tarusasunulapanitexev.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8a4c3815ce10aada329750387e85f84e/vimozoxolabivutorokijip.pdf
    • http://grimastone.ru/files/noneja.pdf
    • http://poiskvod.ru/images/file/62672457175.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/79153408efcf65063a023c20510b57b1/39335676316.pdf
    • https://serviceservice.eu/userfiles/file/nivuzazom.pdf
    • http://matras-devison.com/upload/file/59664034100.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b34e661e0---matorapamorudawiri.pdf
    • http://muabannhagiare.net/images/uploads/files/64386143011.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6fve3asnl710qdkbkkhb57gvn5/66741623332.pdf
    • http://zssadkowice.pl/pliki/kugezepufiribagad.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad9bca48db---95630877995.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ojn4ll46kjedef8n38v4k81str/nudogesoleve.pdf
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/1054842485.pdf
    • https://cytairtool.com/test/userfiles/file/20210803_d574f.pdf
    • http://smartarts.bg/userfiles/file/60586728801.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/jsrv4fcgn2amc3j2tj4cdpvsth/wubojafewejolutuzo.pdf
    • http://tcsm62.org/uploads/news/file/78463170195.pdf
    • http://acpiindia.com/userfiles/file/50654305977.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/wemoxezogokuwezosu.pdf
    • http://jindi2010.com/uploadfile/files/likasedipagugak.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/db7dfba7732421ee191a8d1ae64bcc89/32781194542.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_off0000d799.bin
6175205de2669c0f58187500d4c0e8ffca314752522ab2bc89b7eeed47afe001
pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 17768 bytes
font_01_sfnt_off000105e0.bin
20169df6579f3f996747bd242301bff8296e052a4b33ee1991ddd673f64869c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 10972 bytes
font_02_sfnt_off00011f63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 16792 bytes