Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f8644f9b7d19c7…

MALICIOUS

PDF

89.6 KB Created: 2021-07-28 03:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 358a0965baa923276b77941a88563d2e SHA-1: 308843e5bcf2d1542c82b171dc1ba53933ab6777 SHA-256: d7f8644f9b7d19c71fd99c7e3ac7f098328f71e8acca0dce7d950cc5a0e1d84d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://metal-et-verre.ch/ckfinder/userfiles/files/36874967590.pdf In PDF document text
    • http://pospatrans.cz/UserFiles/File/86844205910.pdfIn PDF document text
    • https://zulapin.com/calisma2/files/uploads/18091862457.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9460d6d5---78377433550.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a726d520ea2---77362119717.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/53129840473.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/nadamaloluluvekeki.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/73136429641.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/gibapexikajufafen.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/91469573589.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c03bd1d5b8---nipogejenesodilaziwuzi.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdc6b9a89---48791600686.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/7c197b0b7ec20c557b75bcc720c13c87/fowurasijolurifa.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a03cabe71---dugawufajowonunivobuxun.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/52337463077.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/44719233540.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073906f596c9---52424934450.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/76563734725.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/76862268803.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f0f3ea9258d2bdca09d97af5bff92c6e/demufijasikiworapad.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713d96af669---xevipakozonusaniwizet.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/89376311724.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tiwaxoxaluvododopoz.pdfIn PDF document text
    • http://le383.com/uploads/files/76749416142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ptv+sports+live+download+for+pcPDF 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_off0000f9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D9 10768 bytes
SHA-256: 822d23ed8d82bc49001a862bfa489570c31f0a96adf17bb0ff1b6c3527f8bd1b
font_01_sfnt_off000112d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D0 17316 bytes
SHA-256: a64c87ea1124b434d3aea03fa8890b8e971f6f84af3a34e7983085ae2797a688
font_02_sfnt_off0001402d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1