Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b7d9c4b0973fca…

MALICIOUS

PDF

72.6 KB Created: 2021-08-27 22:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 326732dcea31e95897c2f253d41c66ee SHA-1: 8650786ad4d7bda1aac31d13c5cdff1524c51923 SHA-256: 79b7d9c4b0973fca436ede7169e77dc5cd2489aa511891b7528ed3e3b1491687
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to potentially malicious or phishing content through these numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/e400fhkh7qqcujpt5au2tgqqj0/vofosogirosed.pdf
    • http://ambvetfanini.eu/userfiles/files/2556282009.pdf
    • https://onlineadda.net/ckfinder/userfiles/files/zisuwofaxedu.pdf
    • http://curry-box-deluxe.de/userfiles/file/kazidavukujaxunidun.pdf
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/15691485933.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/2e5ef69168d6f31505d736c591101f1d/taruwogesakunomifevat.pdf
    • http://bbfederico2.net/userfiles/file/29925588932.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a295d914e---26581610483.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0156b1af89---70604805864.pdf
    • https://geneolock.com/ckfinder/userfiles/files/56215058450.pdf
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/70783593781.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/554r8eer3edcof1ijsc268pdut/zibenazitizetuke.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609691069d074---93604496992.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160776c3faf211---xudoberunelisanotaf.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/lavipomurowusazitosuxi.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/4d34895c9d97c11bbc9209ec17086f3e/93612646972.pdf
    • http://finalbrand.cz/upload/file/89057022618.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87475983b---17527759460.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c867b28bed6---zojodiwakidazadajaneje.pdf
    • https://alakharia.com/public_html/userfiles/file/kufuwusuzikexizotofax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+draw+a+alligator+step+by+step
    • 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_off0000b8e6.bin
b192f10a035eb4ca6cb010af1b5e69f6cf7cc80edb1597989fe109c5b972c7d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E6 16748 bytes
font_01_sfnt_off0000e3e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 16792 bytes
font_02_sfnt_off0000fbfc.bin
78d09f5ada2ace3a90b9d81eaf1c7f4ee3730897bed1ff0e308dcd7cb120e0a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 10792 bytes