Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef70fe788cb9a88…

MALICIOUS

PDF

81.7 KB Created: 2021-08-24 17:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b933336e5e9153513c52f02feda1fc26 SHA-1: d2549015ae4c2978ac7e7f94991e1d9c69c2b8d9 SHA-256: 0ef70fe788cb9a887eebcf6edd8c1b4a9e06fb917a7592d8d4fc5c7e850eba0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. The document contains numerous links, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=generate+pdf+from+code PDF link annotation
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a439d4d0a24---67067321241.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/wegawekojimowem.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8fe813994---wijatakenilijekij.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1d866626---moxomufovukajexiv.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4f8c25cc9---kuwadefupaxan.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072a0708e13a---ruvoxumidawetuse.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/93312751811.pdfIn PDF document text
    • http://bakoca.hu/files/file/50140892887.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16074264db6bdb---vevowowulazuxag.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/50617288986.pdfIn PDF document text
    • http://haki.vn/uploads/files/39422532571.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/40692824239.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/vafenawijew.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1052da8667---48184951149.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/59291081141.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/65178568561.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609caeff3fd70---79195093108.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b7e8ea1e8---47003494246.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/mugesivowepit.pdfIn PDF document text
    • http://canoeing.by/pics/files/56196363495.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/4536876091.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/fovukazizalonomofokelipov.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/sajaxobiwut.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/lixufedarefosunoso.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_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 10516 bytes
SHA-256: ce859bec6ffb882a212e3c6c9fde7f923fb8543de0da89eb223f59475fd8e355
font_01_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 16720 bytes
SHA-256: fcd429bcfa22b69d1388577f97d2ee9384fa1ecea94c64d48dc46fa1ea497d43

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