Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f73879b8a3127a…

MALICIOUS

PDF

105.6 KB Created: 2021-07-01 09:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2cf22a0b2dedd67d2dcb8ccef1e5adf SHA-1: 9a26e584a0722badab5d1651e3f60b1325848086 SHA-256: 17f73879b8a3127ae0ad756a5b4fc80a77db25b9a3d4a21e73ed3ebbc897e101
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites, likely intended to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7ff69024e---kaxagugowuz.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a36916e9a54---88675064311.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55640dcbc---mukobuxusadila.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/751b60ff5c0e371ae9b998bb53b39616/wutovilawasukozuzas.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc7a2e83a---kelif.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca5c64a522---42041892367.pdf
    • https://bandotrading.it/uploads/file/zinukekirorewoberar.pdf
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/sarirakedefupunonojolo.pdf
    • https://evergreencans.com/userfiles/file/45460307974.pdf
    • http://shreyaghoshal.com/konadnew/userfiles/file/456934057.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/490bceae8be94b358200a47c9ce8f3f0/26357504260.pdf
    • https://an-professional.ru/img/files/file/tegitekuvetanepomeligazez.pdf
    • http://18554080.com/userfiles/file/43473130204.pdf
    • http://boschvietnam.com/files/usersfiles/files/nenafoxakubu.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2bd631674a6d225aa2e875d01694a490/67206886126.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/52e9029522df471ef29d839bec3f071c/88350699380.pdf
    • https://stillwaiting.org/userfiles/file/nivesinuli.pdf
    • http://brandnewgoods.net/userfiles/file/38616059254.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/ed4i8tnumk8o5dkje0dudvn3li/gosafag.pdf
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210607114858.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/6kt67cvegnbjq5p9f1hllo8p23/68629891360.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/f45858336a1e4b6e785102d5f205340b/66672007459.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a94e8f740c6---91779036131.pdf
    • http://studiogiamberardino.it/userfiles/files/dipalowixikufaxinakam.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ef90a7cef1e3fa5265a35f9013f71c8d/papolevirawijiwulafiwu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=existentialism+and+metaphysics
    • 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_off000139d7.bin
645e49aa3e1c3ece23a843951ef86b69cdc47dcdfbc3f4330cefcd35e6b5ce92
pdf-font-stream PDF embedded font (sfnt) at offset 0x139D7 10756 bytes
font_01_sfnt_off00015269.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15269 16792 bytes
font_02_sfnt_off00016a7b.bin
22bf09afd581ed5a2425d9dfe37468bb43a4c66268cc80d8bda7ab78d08d2ab1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A7B 17936 bytes