Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4adcb431759c7c…

MALICIOUS

PDF

44.5 KB Created: 2021-07-02 07:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a29cf042879de7c7e5361659d21e756a SHA-1: 4c04c7f82cce175a6fe69710eed0497010dcb3a1 SHA-256: 2a4adcb431759c7cddc8bc5eebcdf158937ad8b06c7e6acc9df1489d1f121850
154 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6809

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 http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd66c880e---61685773388.pdf In PDF document text
    • https://widepolymers.com/userfiles/file/67875628011.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/35ef626edd14f1c2ccf2dbd88c07839a/6687725902.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/515d5414cb24689bcc74178a9d338684/36877236501.pdfIn PDF document text
    • http://boxethai38.comupload/file/99811163539.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/ziwekuxefirovisupevo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3aee0447c81a7c92f6b154c0c1f82d29/ziwapupun.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af143dc4508---bitun.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/37988902905.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/40718577011.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/89603785014.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/pakojipabozuximitowevoxux.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5248b34f2d---lamewos.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/cf1508f47189bd26de8c80badddfb5a2/bikavunaseluresifo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff93f77772---fanexedagizerebe.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/78240726565.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/gebagavazonokomap.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/61904109083.pdfIn PDF document text
    • http://15889163.com/ckupload/files/bojesiduvuko.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/masisimu.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/70695810117.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073a8aec84aa---pamulepelorenulexerosit.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/8722f24d381ac59b429f7ccee2290243/61507270946.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c624b1a0f12a842940ffa83f41fcbe7a/webapadujurenidalefasidu.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/73522715330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=maria+callas+and+aristotle+onassisPDF link annotation

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