Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3601793fd2607d…

MALICIOUS

PDF

97.5 KB Created: 2021-07-01 13:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c32c9399e29ddd9ced6417c2ec08dd1 SHA-1: aa2a7a353f8f02f2f32124073e372d05a0edca59 SHA-256: cd3601793fd2607d6075fe2d1557c7b977ac8000b3e4bafe60ce7bafecb0980f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of these links and the overall structure indicate an attempt to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://queure.ru/uplcv?utm_term=death+the+kid+x+soul
    • http://quickvideo.nl/userfiles/file/60083738904.pdf
    • http://tuzvedo.hu/elemek/file/dibuz.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/73d58e3f87b23e098e8e7dc395561cf4/rudepoluguvajufivi.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0e18b5bd420eac08233a127f0c7b784d/2335890191.pdf
    • http://voszveszprem.hu/_user/file/94583241019.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9de9b04b2---wuwusejaliked.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/s1itrt9fg4n9t93meoev45g9bp/83625200523.pdf
    • http://parkhigh65.com/clients/4970/File/27731161852.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608d248f625e3---71994233396.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/j9f9br544vkieemhjqm0uihr53/kosunegowigofekigi.pdf
    • http://sclifeguards.com/clients/16854/File/78348231632.pdf
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/tatulovorizu.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095d2d17c120---zipesenugimifemilul.pdf
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/liwurasewabetonomuxazali.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/latafuberuz.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/tipiveremimorowomez.pdf
    • https://hogies.com/includes/template/uploads/file/78127836321.pdf
    • https://aashianarealty.com/file/repuwofoperasevukaximer.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609748094e1e7---zorizuzifigufodox.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a922015db2f---rizefanepetumofe.pdf
    • http://www.bufolari.com/public/immagini/file/dunalivaforakoxajuru.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/hb55cdqn7qci96n9el2rcpasub/81185565227.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f59e.bin
302bb86bd7ea47d0749a0a5129c1041f8db04fc7b010058a916aeee1e77a5996
pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 16244 bytes
font_01_sfnt_off00010b6c.bin
4ab531697082fa85e09609003a964f7942265a4c51176bd31d9fd5d79ba426a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 19128 bytes
font_02_sfnt_off00013ac0.bin
21a3aee686e35b132404be12800bd2cf83fa6c3e01ce99e3a68fe6e2c2375467
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC0 2640 bytes
font_03_sfnt_off0001461d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1461D 16792 bytes
font_04_sfnt_off00015e34.bin
d543b5bf4ef98ca185465378dbd1be5deb8d4ea98e31f0d59dfb8038d8b0bd5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E34 10436 bytes