Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cbb8e9e97ebcfa…

MALICIOUS

PDF

73.7 KB Created: 2021-09-04 21:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2dc2cc3df8f7fb89ad809a31e294d574 SHA-1: 669f9556172ef19857a961075e71b5355954ed87 SHA-256: c9cbb8e9e97ebcfa72d72f4c26fe9f6472a5fc60cf0afe707f1f6adcb3d3e7a9
156 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 disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://519pf.com/userfiles/files/fabesirijalemuzotosaluwo.pdf In PDF document text
    • http://aceonlinementors.com/userfiles/file/lofip.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/vjovhjdr1vlqn5m51r0dstr2te/kibamiwowun.pdfIn PDF document text
    • https://aashianarealty.com/file/1074305995.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/38416218735.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca847a6df4---51447137344.pdfIn PDF document text
    • http://jp-cable.com/d/files/tukanitagerifiwi.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/wimuvaxor.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/35397991976.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/gisumufa.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/40564476488.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/sehqrnk02u9eot14ds04foqfsq/68411324578.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/35082749553.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/50794092923.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/rulixivikavoza.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/69998289024.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d349d7d4f09---vexokizux.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/63437272104.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d20f852e311ff425558e77fc2694f4d9/57375218838.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/44954178219.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb11c4efd92---99965941190.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/86701822498.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6adaa4d57---14827146140.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/bosiguxoduvofusim.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/vimasiwodorosaxamoxafibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hybrid+powerlifting+program+pdfPDF link annotation
    • 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_off0000bffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFE 11004 bytes
SHA-256: 4dad7ed76bd8fb116f713cf6d8dea6628c5ad7797e4187eadcf92b0b8c8e49a8
font_01_sfnt_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 15936 bytes
SHA-256: aea0e7387bfd17d041f020336107204559270ebccecff527f973cfdf8165ae58
font_02_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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