Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8738ef4761e4bf…

MALICIOUS

PDF

77.1 KB Created: 2021-06-09 18:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a915e016d8c11292c745362bf2adce85 SHA-1: c9b918605b316d459e08dcc86c1f227de452922c SHA-256: 8b8738ef4761e4bf5409b011681d9b0fad228408781a9ed30a66d00fc5dc356e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://oniceh.ru/uplcv?utm_term=photodirector+photo+editor+apk
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56a4b26dc---67045342762.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/20gqd1vc1651m1l096a51f5oi0/nugujuliw.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11ea8acac5---12951488102.pdf
    • http://ajtoablakcentrum.com/_user/file/garikib.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160babacb2412c---lekonisagopabezez.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ke20rrbf9581mvt6opiru6un81/49531406107.pdf
    • http://abwcoliseum.com/uploads/files/32594123044.pdf
    • http://jyjwqj.com/uploadfile/file/%5C/2021052516520184.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160824ee2a5f25---43455744339.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080b512764c6---dobubadefaxixamogu.pdf
    • http://chataphan.com/file_media/file_image/file/28505444756.pdf
    • http://netpost.vn/upload/userfiles/files/nemokixazugosikovorasewem.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/o2p1mts1pv12kifc96b1g9de55/4134179827.pdf
    • http://files.ibiza-ferien.de/file/temunane.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_off0000dcb7.bin
4a57bb29d1a34a52adf63c65657ab69650befa4c58143b9aa582febbaafa702b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 5016 bytes
font_01_sfnt_off0000edbb.bin
541ba0715338e66fba347447aedc52f34703454904cb1ae3dbbbf23a857c3bf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 11028 bytes
font_02_sfnt_off00011200.bin
794d8cc090a449e0d460036171b2d5b2c749cb0dc3f17972c44626ada68ee3d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 16168 bytes

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