Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6552c290238805b…

MALICIOUS

PDF

91.7 KB Created: 2021-06-28 03:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c6027f4c40a34a8fd653bdeff1fefae SHA-1: 95ddf00e7cbdc76ca0f5b8258a4281a201106371 SHA-256: c6552c290238805ba4622d81c21d505ad85538f06a6355998ff7e9051dda32ca
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads and disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/c8c7b1d63d2fe95014c7a0dab0bc8927/dobusolu.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c4a4d6c61---kikagesovuretezoj.pdf
    • https://medtek.vn/storage/file/tikizi.pdf
    • https://an-professional.ru/img/files/file/87171708734.pdf
    • https://alatheir.com/atheirwsfiles/file/10686411957.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/70126332955.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/44706691200.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/xugopodawefasukukixawe.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2ee98fb14863206979a71ab55bc344cb/55440938560.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/561250537c07c0f1ffbea781af9338d1/14814324189.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3736df8632172c5cc4d3cf8f24a5d5a5/61036314967.pdf
    • http://hkalc.com/userfiles/wilamejuz.pdf
    • http://edwardlankin.com/clients/86087/File/49494576432.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb0b5cacda---29740907869.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b543b55720070ca0c0717eaee0a09177/51417084626.pdf
    • http://sahrugs.com/userfiles/file/31186121392.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/q6bftg3t41aekbl4jqcuvel1a3/90199652431.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/109pojb8q6a49fr10mi50rtk5q/dolomajokegovozerukokaf.pdf
    • https://soudurelauziere.ca/upload/editor/file/15721020710.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d71239278---ragikufopumowegad.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c7fab749d20a40d6e40271059b8d3a9f/42962008355.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738e51d615e---balof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=deontological+moral+theory
    • 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_off00010519.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 16792 bytes
font_01_sfnt_off00011d2b.bin
4e993de30dc9d0e9648b4964cc29273f00369001ad37ae36512f2c466af593a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2B 17020 bytes
font_02_sfnt_off00014983.bin
7981741cbe6ba9bddb87e5690114c5f070e8dfe2cc7d7645fc473db83eb0c224
pdf-font-stream PDF embedded font (sfnt) at offset 0x14983 10624 bytes