Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c8e16e55f4d499…

MALICIOUS

PDF

78.8 KB Created: 2021-06-26 06:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 737404653b3b9db960180d5be6497188 SHA-1: 3861256109e124fc1c3ede753b207d3f71afeebb SHA-256: c3c8e16e55f4d499f8c3b0eaaf209390067b6973c91b695a356e3a12a773986b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The structure and URL patterns are consistent with techniques used to distribute malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://detikakdeti.ru/img/file/xudarexosazogifobanu.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160823ed3ccd6a---62281512498.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/21b2a6b2b75e80a880c8612ede96ec41/vamove.pdf
    • https://dprkoreatour.com/uploads/files/vinaxetojajijakolukuz.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b3000d0b2f47d3bb47f45382e677a670/nonigenixorozejid.pdf
    • http://geodeslaboratori.eu/userfiles/files/35525985985.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607509404b659---betazapi.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609aacc3e8263---2857956027.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/20b5302b1e0e1243b294ee6a7d85f8f9/63663104889.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6e6f39351---lulusijepimak.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf71ad2784---fuxebibagukidawar.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/cf55fa25b44468e2074412d54e97e66e/8375794871.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/1049ff6bd81ff253f2c498a8efe266c7/tobegi.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1424cb38---48194393683.pdf
    • http://mini-garden.ru/userfiles/file/40912796893.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d9f18c58fdbf0a3bfeb6a23930d656a2/64797157510.pdf
    • http://seoulsquare.com/userfiles/file/dofopef.pdf
    • http://amdind.com/userfiles/file/60335730986.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16075b71ce2d54---60557328098.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/4ako7bhcfn3ik376psoiq5lo77/79928446517.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ac174e6c1d259c77f2945d9fc3b9e46/37525652137.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/7357113fc2c49efa51e54bfe9e7c1bd5/dovaponunaza.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16098dd0f22763---gekopezixapufujoxivozitu.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160760ce43243c---legudupijebu.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/zizijazojivekufeb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+to+pdf+joint+converter
    • 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://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_off0000d27f.bin
da29d3f3476b723f922f1c8b285be1d2ff8aa9932b18141ff8d5f7e71f5588b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 16796 bytes
font_01_sfnt_off0000fe32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 16792 bytes
font_02_sfnt_off00011649.bin
1aac895473e7550571c8505847ade96dd178a6192489cfe160361ccc89048755		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 10432 bytes

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