Malicious PDF — malware analysis report

Static analysis result for SHA-256 eddb757fd73d39c5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 22:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3745a1455efe5f9b3175ae73e620885 SHA-1: 33bc3d85945d6fb157ef931c684947158b936a7d SHA-256: eddb757fd73d39c53db49b6d2c6b2155c63eeb4f74ab75622817efc80b4bc431
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs and link farm indicators suggest a phishing or malware distribution attempt. The document's structure and the presence of external links point towards an initial access vector via spearphishing attachment, aiming to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=words+with+qat+at+the+beginning PDF link annotation
    • http://righetti-ticozzi.it/userfiles/files/84326308727.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/45518694369.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144b15a1fa9a---24321659251.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83587613943.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/dapemi.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/wegusenizekufojubiranom.pdfIn PDF document text
    • http://cityfate.com/files/files/vuketipomupaj.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ab0f12e7---24777572367.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/lipaxunuwinudezonu.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141c6765a5d7---9626127035.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ada70f8a---jusefomujojipifizug.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-4/20210904001657562242.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/pexajeponibiposubukurufam.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/67482968061.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/tojufavujepexeriz.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/larobed.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/14197540957.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/03/file/20210903_224808_162.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/98552665802.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5jv4to4bubtqb2fb2c90ds3ah7/lusekiw.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311e25a5117---5655869179.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_off0000d68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 10844 bytes
SHA-256: 9042975f4ca696da8e1e474acd004448c6f937d05a7b8578e9ffe08ad94a5b36
font_01_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 19620 bytes
SHA-256: 1437f1006371665e59969d085add878eefaf008df0ee964906a692f9f9198bdb