Malicious PDF — malware analysis report

Static analysis result for SHA-256 f344364884d1e617…

MALICIOUS

PDF

85.8 KB Created: 2021-08-22 01:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca734d85ca2db66771c79d76475b49b4 SHA-1: a12cb3f21e73d17435f15d962f095919968f0965 SHA-256: f344364884d1e61714c18c017f6ef9fc27f867af5f329d9126c3140d4f5d5087
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a lure for downloading an archive. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions for accessing a password-protected archive, a common tactic to bypass gateway scanning. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160854ab482108---fewor.pdf
    • https://fluffy-chins.com/images/file/11364946652.pdf
    • http://alnoorcity.com/userfiles/file/34612992183.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/77379235934.pdf
    • https://burgas-remonti.com/userfiles/file/22009485165.pdf
    • https://dineflon.com//files/48856101990.pdf
    • http://ashioke.com/images/library/File/kikixumumilovalabutuj.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/5tnpric0eoi5093v7a65b4mk7l/vutevegozuziginejutizod.pdf
    • https://linker.tw/files/13113582029.pdf
    • http://minhledtran.com/luutru/files/lunijojosewobodag.pdf
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/gubefeza.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160710d7345117---kobed.pdf
    • https://mattress-leader.com/media/45840643760.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05046cf965---vimanewuruzax.pdf
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/rarinix.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607987201dc39---momasenonavewasagovesub.pdf
    • http://tcihk.com/userfiles/9413235865.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/memunureseboxu.pdf
    • https://rajatotogroup3.com/contents/files/88806784773.pdf
    • http://ctkupavna.ru/upload/file/togojulumoseworugefaw.pdf
    • https://lacecinella.com/writable/public/userfiles/file/jugorarora.pdf
    • http://dbexpertise.fr/catalogue_dynamique/file/61102280508.pdf
    • https://zapcdn.space/web/img/podborky/files/vagidetotofikikiniwaw.pdf
    • https://ahreco.com/uploads/news_file/duxavevopi.pdf
    • http://akcjonariusz.com/UserFiles/file/55265143217.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fast+and+furious+7+full+movie+download+720p+in+hindi+filmyzilla
    • 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_off0000e90e.bin
67418413b19e728b2764c42ca4c1d0c7fd9741a11e37e3b2bdbf34bec41d4fb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 11456 bytes
font_01_sfnt_off00010418.bin
7523876776d5b3c6b51a24df1f777ac96ec317d551529e3edf60a38f4ce64f64
pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 16880 bytes
font_02_sfnt_off0001300f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1300F 16792 bytes