Malicious PDF — malware analysis report

Static analysis result for SHA-256 df78f72a7fe204c9…

MALICIOUS

PDF

96.4 KB Created: 2021-07-02 22:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1742100daec3a666e8445160dea5450 SHA-1: 7962993a16d4cace833c9598b79beff72fa2b698 SHA-256: df78f72a7fe204c9949b4d23a194e0c8691655c9d364402c8371f2306209853e
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick users into installing malicious software by posing as a necessary browser update or extension. Numerous URLs were extracted, many pointing to compromised WordPress sites, which likely serve as download locations for the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://archism.ru/uplcv?utm_term=literary+devices+sheet
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/dumamamujumune.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/423isuvthql56r6blsbr3vk4s9/dogagabukekovoro.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160764ac8cbda2---lixijegimasojisusev.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc1365398---48281831530.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/silfusc10to8pg4jb6evskism6/farirogaralizesovu.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/timodalivilixebobafuwig.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959b1f0d461---64300633711.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dbe39d96d---13628455649.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/49845f354e8ceaa99a3c5a3b45875617/20967909792.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/e60c570a810fce0815d03abd45b5f9c2/wilutagatewutiribenomoli.pdf
    • https://gonguyenkhoi.vn/upload/files/nekojokaxevoniwizilobuxe.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b740d99c69383d425b60a237a692ca57/liwimires.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/rituwikumidutedijopa.pdf
    • http://adveotec.com/img/file/64021444952.pdf
    • https://datajournonepal.org/files/japazananawadegature.pdf
    • https://realschoolspirit.com/scauserfiles/files/28635168978.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/4996df5849e0c2d3391dafac99864669/27485823359.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f3f1da73---kovaxaralisusidut.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed07569f1---dofiwikul.pdf
    • http://pogotowienaukowe.com/Upload/file/93339312172.pdf
    • https://anmimar.com/royal/userfiles/file/44706278959.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ed41be803---likojiro.pdf
    • http://adabaskimerkezi.com/upload/file/87161534670.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609263d81987b---43628517538.pdf
    • https://invest.pl/userfiles/file/58543359928.pdf
    • 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_off00011797.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11797 16792 bytes
font_01_sfnt_off00012fae.bin
dccfc4d594cd5d72133dd153d9a8fc9fb8aebbe29f19790aaaf12f93f3375eda
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAE 10336 bytes
font_02_sfnt_off00014725.bin
65bb4b021fd76ed07a0b85650ce9ca7e2aa7dee02c3172bbb6b8fa56c010ecd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14725 17616 bytes