Malicious PDF — malware analysis report

Static analysis result for SHA-256 db683f54a8df075a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-15 17:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d1677aeb21507be1f424b0a3dd5bdad9 SHA-1: 091a6f426b443d2872531a6f6e5a152adfb27ca2 SHA-256: db683f54a8df075ac1f6c18f12abdf4d27dc48b32641e6782b549a202ed84c8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://drafthe.ru/uplcv?utm_term=tamilyogi+new+tamil+movie PDF link annotation
    • https://glycocalyx.nl/userfiles/image/file/zulirapivivajesanukuji.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/fujivugesi.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161419b00b4bf0---bofowatolupu.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/papukopebibagusemaxameme.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/pujolawiluvumobedotanoja.pdfIn PDF document text
    • http://metallpress.info/files/66962650417.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/39084506580.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4f9cb9671ce4a532a6b0a5ae98637baf/42993587246.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/47651322848.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/bisixurozir.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/xirigexirisofasowurobin.pdfIn PDF document text
    • http://innotack.com/userfiles/file/xodozagex.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/komepo.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f315a8323f---72721868650.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/41680394157.pdfIn PDF document text
    • http://bienbao.net/uploads/files/95094503049.pdfIn PDF document text
    • http://plise.org/userfiles/file/84515933574.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/jesijatopemanesemuwe.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/99902209802.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/21431291123.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/95ef99518fb4a501f73ed2d64dfa62e4/80614215905.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141799019a18---47245040641.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/masewekibewejowatazi.pdfIn PDF document text
    • http://infosierra.es/images/editor/73136905950.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/14102863967.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/funavopewowijasexopupag.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/dapaguziwusutuxoluki.pdfIn PDF document text
    • 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_off0000d256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 10412 bytes
SHA-256: 3c99209259423bfd597bbb70a9ec2c52bdcb68a3fbbf379deb120a24e8577ace
font_01_sfnt_off0000e9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 16564 bytes
SHA-256: 049b1aae9607ceb221e3093deebb71b87a96b91dfaa83854eca4422e4611f97b
font_02_sfnt_off0001146d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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