Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2685c0c0b87276a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-23 06:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c025ed8e6be59fc755062e87cf85921d SHA-1: 9e0067007753f9f8381a880714428d4744170d14 SHA-256: a2685c0c0b87276aa030b2134ca7fdb42540abba5fe9a1b0f716cc970bda7fc2
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, 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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5626

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=free+games+for+samsung+galaxy+ace PDF link annotation
    • http://spad.kr/userData/ebizro_board/file/37369045030.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/45614693147.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/vopixubekajuzutezozofos.pdfIn PDF document text
    • https://lasanisports.com/files/kajusimumelog.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/rifimeduzixigabipiw.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/35791575657.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/88280955584.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210918135633.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/zakezudigugukawetiz.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/nivizusadofapazojuki.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/8272721427.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/67175716407.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/76251775600.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210911070226.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/siwedusunax.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614431ba61ef5---jelesegovubibixojuxob.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/vajepu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/025affa489525875b9874201cec6185c/69091203463.pdfIn PDF document text
    • http://inspeq.eu/public/files/96515674165.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/pobamogekolufesixuwel.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/39687542870.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6871ea7d9---78582491319.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 10780 bytes
SHA-256: 7dba0404f3ec1cff32e02e05bad59039bf750379e50fc7086376e6d4ccf06366
font_01_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 17568 bytes
SHA-256: e5f3bc63cb307b1d8e0460b729a80dc352a9881c11428a077e5e516fb2ba1d6f

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