Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccaf08e2b2102d5…

MALICIOUS

PDF

76.3 KB Created: 2021-09-03 05:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2bfc153b5023f3fb8ae52457bfc3be98 SHA-1: ff99d12656eea2a30dfc63d4031cd56ca40299f4 SHA-256: 5ccaf08e2b2102d5b8ac210ef93ac866d7315ac55431509fd8c894b11939150f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics indicate a likely intent to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=christian+teaching+on+faith+pdf PDF link annotation
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3fb7491df266a5c5ce9e7fd53a667ad0/mabisejumut.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/zolugefotufoxi.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80f1daaf5---sokub.pdfIn PDF document text
    • https://ewt.cz/res/file/71873163268.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608937ef8b56f---16066077647.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/gezoput.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/bovafi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737dfe09df2---50748301965.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ba26ba7bf---2308345201.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/17736109001.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160772fc01d38e---14257292753.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/lokif.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/tofelobibepoxogogi.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/41413161627.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b1cd628f---xagafazigebisazo.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/zoninonalijumila.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/webofadixagi.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/rimerarozi.pdfIn PDF document text
    • https://promise-land.com/upload/file/dagumugokemixasadivij.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/xikamifu.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/kunibuwutaweboken.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2b15a9726882540f6a120f4e0ce97b5c/nedazulapabifitulex.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_off0000c881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC881 16568 bytes
SHA-256: 189a34aa7299c371e82a685668a82c876ccad31feff5f4bad66dc58ebb0579bc
font_01_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 10884 bytes
SHA-256: 73a4d39dff1f6989031df9c2bb580019f852f76335a710be8a76e1beb5d0bcd2
font_02_sfnt_off00010c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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