Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a9b68477a532da…

MALICIOUS

PDF

73.4 KB Created: 2021-05-16 09:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b117a70b894f125cb62cee451ad4ec69 SHA-1: 2f20e70210d35b08ee519baebc2945f0887aa628 SHA-256: d0a9b68477a532dab99fb7eb2596ef4af413559bab6feee9aef0a30aba92416a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a worksheet title, indicating a lure to disguise the malicious intent. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=liveability+factors+worksheet
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8516ff5a3c1e52e9693b0fcfdb2ba3fe/3962554766.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/b5b9eec0fef6967f473a085285c47fba/65041578244.pdf
    • http://washchienluoc.com/upload/file/buvilisoxu.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/fe2a6a84be474eb3b5fed0c582d9f1ac/45458068789.pdf
    • http://webbuilders.com/files/file/dufanivozulokubujas.pdf
    • http://botosani.ro/img/uploads/file/sazebis.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd82dabc2e---juxuruxixezusa.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/4f89dfac97754fa3d6b5f79e6539ab46/kumurekodozi.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19f81c746---55095662288.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/54bed3f3167ddd551d4b8925ee838dca/zamokixodadidexober.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/4b0cfe28156fed5c6a7502107cd06f52/16850857200.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/25f506ff2d19e95cf52e525c66451f0f/91777285068.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ks5lld0bkp6fqf7cg7ia2akmp3/nivupebekefoxuv.pdf
    • https://anukulagrotech.com/userfiles/file/rimeribiga.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755d87325ba---keditijadiduxoresoju.pdf
    • https://paperland.bg/uploads/file/72215377176.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd43.bin
04cf004efc6a55c5d72c6d976344ddbd73f116c6eb371c447441de671f316e5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD43 5368 bytes
font_01_sfnt_off0000dfa3.bin
d6a7524585fe3cad1e2a5adfad4508ec26daa9737dd11944e9d99194335073f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 10508 bytes
font_02_sfnt_off0001037b.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 16060 bytes