Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d494d655034fe1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 10:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d014fc32bd5a19aec6e33093e205ef9 SHA-1: 8a433088a6d66ed8c9ffc0d5f5dbec910f592430 SHA-256: 04d494d655034fe1fcb08a167f40ec2796f1e1a4f172cc65fa1d3f85ca131b38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to disposable hosting or compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The embedded JavaScript is likely responsible for initiating the download or redirecting the user to the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.db-ynox.fr/ckfinder/userfiles/files/7340949430.pdf In PDF document text
    • https://aldurra.ly/images-editeur/img/file/18668139572.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/17678490287.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/99840087566.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7581523c7---vufugekenaxuwenojufus.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/kesifelekojisikaker.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/vugugiwixukupenatekerad.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/6hbp5t3taierrnee94ng96sm24/gubezonizu.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/39389534500.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161343716a98e4---pemadifubawisam.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/nigogisozawegojevore.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/83628938040.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/55009439293.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/rivitabu.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109072250075685.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/20126588699.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/raguxonem.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/lanipepiv.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/lovoguvolupe.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613740dac9f68---zifopur.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a48b3bcb---vezegiponede.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/dojisefififuzijuwo.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/muligimosemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+theme+notitlebarPDF 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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 18164 bytes
SHA-256: 3b3bd2b7958b3f585676294c90c41c2e96f1559d62b9bb7f94c1ab290914cc45
font_01_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 10464 bytes
SHA-256: 5278e73d977cc2e854ebd9fc91858206ef0ab59328c9212ecea628fbc211f7c2
font_02_sfnt_off0001212c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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