Malicious PDF — malware analysis report

Static analysis result for SHA-256 64740b3de38731b3…

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 23:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb0ddeb44c7b0fcdd9ce37d1cdaa8d75 SHA-1: 59d823f0c0384ae4f1ed0fc1fb2ed217680ff8bd SHA-256: 64740b3de38731b340a21dbb8b39fcb8866716018eb37ebe0074f8a380f3bcae
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

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 https://arrad.ch/modules/ck/ckfinder/userfiles/files/32917434522.pdf In PDF document text
    • https://luminex.pl/upload/file/54565407380.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b2c49d474---47015979156.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/64816d2f9806d5c8aff741505a594dd2/xenote.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/gifanunasukazeriritidu.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/xozexuvatatidof.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3f4c1da492a31c8d044102fe271493c1/relozixux.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/vujuzejumijivewotujip.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/vawixejexutozesowu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4f9eeddc---39020492050.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/nekomowawesojepogikefiri.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130bda051fae---50718048110.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be92e9bf623---72839101521.pdfIn PDF document text
    • http://funperm.ru/content/file/niwefaxiwe.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/6975435518.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///vomas.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/radubipeketomub.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/silekitos.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/p58jeji4rkdth953huhj8798d1/67270548765.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084b4691b987---1528236027.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077f80981379---wurijipijipo.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09ec1b808---surupemofekigazevaw.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607840e9ae00e---golavinadutimofigodadepas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=nissan+murano+2015+manualPDF 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_off0000c148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 16592 bytes
SHA-256: 785b32a733485dc063ee14d2f87a1b39807ca7f2b8330033bd5e700360a5809f
font_02_sfnt_off0001044e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 10544 bytes
SHA-256: 464acb9f09b58536225cbd6ed8402e36744676554d4bcac62b5ccdde85009cf0

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