Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f200e5399fe3ec9…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 05:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4ad6ee1745acdc64d28da495765e6fa8 SHA-1: 961dc2221acf545b1835bebfe6c1a752d53fe2b4 SHA-256: 2f200e5399fe3ec9a4a40267e4ced60c09f70302067cf8c23f09b035c8937d00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://allytemp.ru/uplcv?utm_term=research+methodology+format+pdf PDF link annotation
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5b20247d---tekewusisaxopabusamebap.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210811_005CFEFD9FFE9E8D.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/c5a3b4a7200d42cbe756fbb2ec9f27fa/96107277825.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/kobiwefajoramoziwutulim.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/tivotovobo.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/jiponiwe.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/53910981752.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/wobelivutogozapifenijo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/lelun.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/84097966009.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6ff094bb5---34119717270.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/80979828952.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a17ee43094---dawelajegudatexo.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/e3navvcm6nhdh9kuv060p23c61/fumufomomev.pdfIn PDF document text
    • http://altinay-law.com/images/file/gejazejoni.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/6765bd6b5ae6f56316ed042abf22044e/79719330415.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/2eb042b5d9e96777b52687443532e221/68516140850.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/20168776349.pdfIn PDF document text
    • https://avenue102.com/uploads/file/41906348560.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/egdodc59q7hmm9rii7u5f9acq1/64240707987.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/zepagiluvubejebejukidum.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/63026155777.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/59586760624.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC47 20916 bytes
SHA-256: 85e9f0bb8920fb2db7c8c1d0a4f4b8ea60aac9ee4985089a54a3743e285b2de0
font_01_sfnt_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 11032 bytes
SHA-256: e9096eff48ebe7ac0b47e900ba759bf37a0cff3074a77eb2d3aedc692af4069a