Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf0e6579ba61598…

MALICIOUS

PDF

84.6 KB Created: 2021-09-11 22:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 234469992daaca734734c4e7d02adfb3 SHA-1: 929b11b928949e2e5239b8c2c89744a685be6a35 SHA-256: 8cf0e6579ba61598b8da44c91bad943cf6750cec0b89bf96c196c122155a325b
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hasyo.net/files/file/86547287454.pdf In PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/togel.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/1305047441.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/pufepus.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/nidogoziwosepiwotoso.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/7901949062.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/rubemiwenatas.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210911023045.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161359d35efb28---zomupow.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb0e99eee8---93420103385.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/99625402884.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/zizanepewawepo.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/89392686563.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/worepeke.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/58066647723.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/wateveda.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161300eb619a1f---womop.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/93504906085.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/tinakobuzesuxelaramib.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/dipewavozat.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/92764602959.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/wifuloruzew.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/zomufeluzubulajafobise.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ce486b4528f62f62da1ed8c80db90954/vigusonofurisiwosujevad.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/58558033693.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/nodekugelugepexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+install+unknown+apps+in+androidPDF link annotation
    • 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_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 10524 bytes
SHA-256: 3a8f0b77c382767a00d23757ea64ca114d4f5a65c48b763212a866eb1610fe23
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 18288 bytes
SHA-256: d0f711427a7ceb2bcfa6f62790abb63a4123fb6ed2d64f0a0486a5c7050f73b3
font_02_sfnt_off00012c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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