Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d69203bffee4dba…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 06:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 97d72c20e916eb2a31bf970c2467ad58 SHA-1: 0ff89d7ad026f6ce059a502ec55e9fa54f327358 SHA-256: 2d69203bffee4dba423dd3b27d239a3ff0b2e385f926c3f19097cbd098646d7a
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://pixomot.ru/uplcv?utm_term=the+late+show+with+stephen+colbert+live+stream PDF link annotation
    • http://jtylek.pl/Upload/file/zisabojovimuwawadu.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/853318814.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/73061010801.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb159d9f4e---ferefoxuku.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/mitijadujukebi.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/xivivulukojuxudaje.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/54445326710.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/xunigunojup.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/bapudikurojupobu.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/26460437667.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/bobetalerapevudikoxa.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/5207338892.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/xewamoperisar.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161384d609fd7a---wilafadetinobopulunivoji.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210906073146.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/60467056557.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/82073826796.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///nezadubimumexufuf.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161402afaf2d72---guzidetexarigevuvot.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/nepizigakudemimir.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/48609977713.pdfIn PDF document text
    • http://annabarons.lv/files/files/48458922296.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_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 17476 bytes
SHA-256: 66dfc847bee94d784a0fdf0b18825f05c18e20965d4a031988cd4c2008bd0c43
font_01_sfnt_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12468 10892 bytes
SHA-256: 6c98ec96350da00ed7b305d2f842add4390d4f72cdb942775c0bd3430017e912