Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff86a5a4b610059…

MALICIOUS

PDF

77.6 KB Created: 2021-09-02 14:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3d2cd41c207bb15341e1fd045971e4a SHA-1: 639bdce9e3152955a0c0fd46b3db81862db4ba90 SHA-256: 1ff86a5a4b610059446d135a670e37a1dd597d958c33185ca9ffbfad31fe1da6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. These factors, combined with ClamAV detection and ML classification, strongly indicate a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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 http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/rikilufodosinote.pdf In PDF document text
    • http://healingtown.org/userData/board/file/zunoritulekedodanedafij.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/kageredivozipaxupefaz.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/csonostkm6ame2n6324ip7mtk9/ragalilomakozarizer.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/zifosemuxusaxaxovexetufo.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/lupuzekaxig.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fho0fubr8udcm3au5kaqsaj3mg/65787611903.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202108150804476098.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b376c4d469d---57274264174.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc352b4c17f---jitasigokafigugo.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/8049186827.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/fuvuwofixike.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/25772949867.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9a37ffcf43130a555b6d86dfd9e21f4e/47250117997.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a70f002908dcb979a42ad071ca9d0359/minosuxexexigekaxo.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/vinexo.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d49b0db17777f992428ed97e65f68912/27787640250.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/4da5e074051d2118f154ec6e591435c1/maxuzexunurekunuz.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b0f6c5bf1---gatuxed.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/1u4rf0b53mm33hna773ioa7973/54189372681.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/39593514063.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pevave.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/zedatosib.pdfIn PDF document text
    • http://dentistturkey.com/image/files/66625349165.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a204dca2e86---29661538622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=assassin%27s+creed+origins+art+book+pdf+downloadPDF 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_off0000c6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F5 18128 bytes
SHA-256: 60a12ace3929a0659eba9ac0ee2ad8a4f0c6a0ddc027f68df6daaf4f5786959c
font_01_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E33 11128 bytes
SHA-256: 1accd2ea5224f861385c94d9d003fb8593e118645646b1200025afe334f143d1