Malicious PDF — malware analysis report

Static analysis result for SHA-256 2966def61d753642…

MALICIOUS

PDF

87.1 KB Created: 2021-07-07 16:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f847318cbe10624e5b8cf9fbc99968f7 SHA-1: 91cb89e900746005081fe796c82d0e690d2001bd SHA-256: 2966def61d753642a5e0c55471168b8e02ba3ca6e7cd5255bf5e5f7653f4c299
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The presence of numerous links, some with 'utm_term' parameters suggesting tracking, indicates an attempt to lure users to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ed1a3a62b---25496250433.pdf In PDF document text
    • http://apvn.info/userfiles/file/16824881855.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/14798027812.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607db552e880e---63043711145.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/xoborejufemosab.pdfIn PDF document text
    • https://mfdesign.hu/files/file/biputurekig.pdfIn PDF document text
    • https://armenia4d.com/contents//files/tezam.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/luzodapizak.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160945c2a83849---91819376337.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/e5a96ff58cd688c51dbc9c560426fb32/39841353662.pdfIn PDF document text
    • http://ibb-online.ru/f/file/jujip.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/48322650008.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/eehicc1buun9murje0l9b2g4k4/82395844774.pdfIn PDF document text
    • http://wajl.net/img/file/2021627201914.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095fba02f7d5---pavagitujubavidebugifakas.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621634422.pdfIn PDF document text
    • https://ambalatender.com/upload/files/nokiwerilasomulitosa.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/80437517502.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4538bbadc---visanuv.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/55607067597.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/gufapo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c31nbrbugkkdu4g4ak91el1bc6/ziponapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kylie+jenner+leaked+photosPDF link annotation
    • 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_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 10816 bytes
SHA-256: d3881f178a0836d8ed922f6582a0b11251d994e8a2017ea861898b33dc697c2e
font_01_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 17728 bytes
SHA-256: 925e7458a456c85efd8853f863ccf66112541aac3a0a1462d2423b2cbdd22bc9

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