Malicious PDF — malware analysis report

Static analysis result for SHA-256 49441ac1bae7e166…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 19:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a9eeb230c6d7491cad78a667091b2012 SHA-1: 7c50c4011787a91ddc34708c6ec6fab11637e053 SHA-256: 49441ac1bae7e1660470c4c63608bf5106bbe3c2ed032e15d4d1584da3c19d8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to lure users to external sites. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The primary attack pattern involves directing users to potentially malicious content via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=wwe3k+game+download PDF link annotation
    • http://vegman-kzn.com/ckfinder/userfiles/files/28605857616.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/5634767333.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/1122464204.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/dodabi.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/59018461064.pdfIn PDF document text
    • http://wawa757.com/uploads/files/bosiniken.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/60516429139.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/kokibirojodufopibotased.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/fafimaluxajar.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/vafiw.pdfIn PDF document text
    • http://gibisch.biz/files/files/sipagurugepuzo.pdfIn PDF document text
    • http://shesob.com/file/files/19979915629.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/7369476522.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/56335977109.pdfIn PDF document text
    • https://thepainter.asia/upload/files/jeluzeru.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/lofitutomi.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/64225999824.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5749138e8ade33830ff5602669afb80a/lutipomefizoxadaso.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/71981795862.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/5ed2iuc4h4fgnjvv7pl3n75be2/joxuniloduxuneredubil.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109061853372041.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/fab833809c5328bc6ac81a652b8afa40/97050796395.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/94026753413.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/18514424538.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/suvaw.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_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 10476 bytes
SHA-256: ec711eb74b1ec023771662a9a851220f37e08da49aaedf5b3952e90e2360d9a6
font_01_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 17720 bytes
SHA-256: 7100fb8d8c5b26f3b4b95cb502af0b9bf3f6e7430c134d427b056f65b248858c
font_02_sfnt_off000129e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1