Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efec61030950c3b…

MALICIOUS

PDF

92.2 KB Created: 2021-06-27 20:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c38d735d080ae3b71ead7f51a732284 SHA-1: 28238fe25157cbf6f6b189c48339f066a06d9235 SHA-256: 5efec61030950c3bd00dcbde169fcc88618a93779dbb1879e2318d1548906358
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of external URIs and the nature of the link farm suggest the document is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=c+scanf+from+file PDF link annotation
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0073343738---61147303153.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/57417943580.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/20520780153.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/66328000980.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wepawipozuremoxeridaxip.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090031d15bba---24339098656.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/didexama.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fass9soal88t8ec8gd3i6tv1l6/77952666136.pdfIn PDF document text
    • http://ausafe.net/images/art/files/luvumet.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/70573093952.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/baa2b77bf2684d0b2de5197d16ea79a0/32284324279.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/15373512004.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790d1e83e74---14115892298.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceda78808b---3930616278.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160758a7fb7b46---tejazagexil.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/7e35ec709ec9d6b3ffebfba8d3a74d91/62973393616.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a3acbff79f9763d23e23b517df6aab93/34790844251.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/zatavekonexol.pdfIn PDF document text
    • http://aven.su/userfiles/file/duropazipodokeduwolekupo.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf70278d5---punepomudu.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae62e045ca8---fipofidemadogerujikurux.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/aad9ad4633e39c4f7f0cd2dfa90b1534/xesijufaze.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/63001851626.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_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 10432 bytes
SHA-256: b0f4213c055bbc34de7cf29b6c7541a4240b0392864df99b503dce7d01fb4f95
font_02_sfnt_off000132dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DD 18780 bytes
SHA-256: 42452541f45b03b0f628475237dc59f26e9a059895b58398cdfe1048d8dea8e0

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