Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe56cb7fddd1ce50…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 16:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 085e5a2c6c5c3faa0afc910035da7bf3 SHA-1: 55dcde1c905b0053b18a4461b4ce8580aec27445 SHA-256: fe56cb7fddd1ce506a718add66771a5b898473b494dce644876e2311c6bf2068
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the nature of the links and the detection suggests an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://jjkxmy.com/upload/files/202109151426417559.pdf In PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/98774042967.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/24672262120.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/risemut.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/83133345766.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/mopivozuvumakaxanizunari.pdfIn PDF document text
    • http://goref.ru/files/file/98126009486.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/mizukutidobiwulazomune.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/fojujusapejijodixerafezu.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/66872240556.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/taromorawesi.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/wesogovoreduwipuv.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/10165186034.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/21012631302.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/76034750870.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/t1p4f6jjd2oe2ri1oleitla905/41770418614.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/52d3e1197fa1e8a757f0b9c4a6a6f8e7/40405830364.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/60053033401.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448673cce72---sajigexewavenesuvogegivo.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/jevubamawaxudikazop.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/14953377637.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/865f6e1434006a882887ce0217489bc0/61411275541.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613284bc2d721---mopumosala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=boss+full+movie+akshay+kumar+watch+onlinePDF 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_off0000b442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB442 17224 bytes
SHA-256: b660db160afbbc8dfb061db14b91f1acef6a511ea13f6b50d121f677c45ed000
font_01_sfnt_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 11112 bytes
SHA-256: ddc336e4507b7370ec6f5bfd3e0c22d0537ffe7c598ac00d17e04000fa994083
font_02_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1