Malicious PDF — malware analysis report

Static analysis result for SHA-256 8febe0032c9b3406…

MALICIOUS

PDF

90.8 KB Created: 2021-06-30 10:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7e39ccee7db2bb643a75fc199e16946 SHA-1: 04a12149f8cf6f02b6945ce7f97dcfb63be8ff37 SHA-256: 8febe0032c9b3406d425ecd9ebc4cf37502c27f9571292e407a77b93a5f763d5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links are likely intended to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709d3b26559---61153089444.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609921391794b---nebizubolodafiwakagudixit.pdf
    • http://akkoryazilim.com/userfiles/file/14330977409.pdf
    • https://standsimulator.com/ckfinder/userfiles/files/fidezimilulifi.pdf
    • http://upbfassadenbau.com/upload/file/wamugikepamar.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/045ff4a4b35e2ebc2682f7b6ed0b96e0/jisun.pdf
    • http://vitanova-cattery.com/upload/file/18262049304.pdf
    • http://pcccphucvinh.com/upload/files/39875824807.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da5c04bb568---56117987615.pdf
    • http://ubest.ru/images/file/15551551709.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/visivinajemoxidosas.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/20238124017a4ed7da2736beec1f49fc/19103737069.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/3522386d6ded2bd0cd049c580b5bfec2/denijajorubegisutawe.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/47ba23b7430c61d6f9ad70a71be2dd54/71349480275.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38c63120f---25032909487.pdf
    • http://intrinhgia.com/admin/webroot/upload/image/files/xuvuzuzonedumu.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/c9e9b5e0cc45e0d1d9b0747e4faa9e1d/12013616802.pdf
    • http://raffaelecavazzoni.com/userfiles/files/kunewasudi.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c6575e91ece1c03e9f36f8a2f60f97d8/43182124818.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f0c7c029ef0814d89dc038b6e669a5a5/84768159535.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16075ade374d2e---zowivovi.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/6b43d5201a2f3ef7eb36cb9ccc3d2777/tedamotoxurevezugasevatap.pdf
    • http://garderoba.sk/images/_file/17279600602.pdf
    • http://www.anclupnapoli.it/userfiles/file/juposogugux.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/0a3a4bbb84d61cfedc0e7316430d8d8c/wijizadukimerugiromonut.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=excel+add+watermark+to+sheet
    • 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_off0000fe11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 16792 bytes
font_01_sfnt_off00011623.bin
632435a3fa2be3de201417a1a556cb2fd754f52aff955af2f56b434f159c1d6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 17364 bytes
font_02_sfnt_off000143ac.bin
90db3e2ca081e5ca0c4c824603b5ae4e8fd180fade6085d05d78b79f424e80d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x143AC 10700 bytes