Malicious PDF — malware analysis report

Static analysis result for SHA-256 020817bf5e6d5517…

MALICIOUS

PDF

85.6 KB Created: 2021-08-25 04:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed1614c6c5f83cfd2c322e8f7f753d45 SHA-1: 5a5fcf54b5e15094a3a6bae597ce288b3a0caf88 SHA-256: 020817bf5e6d55177692f4f346f42897e1fa3155bb63ce861ced08ff71da9b02
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves a link farm designed to trick users into downloading a secondary payload from a compromised host.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.pattyn360.com/upload/forum/files/20126476903.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ih8vou9epjtggjjodclikv6sha/62103951767.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/18443143360.pdfIn PDF document text
    • http://dentherapia.hu/files/file/68571895778.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/51c5e84ca29197ebbe7dfdb12eed2894/gikijoxupilafezisulibi.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/82522192563.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/30842799727.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/40450204229.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/dcdc3e5fb4524c1850098669685443bf/fijifeseb.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/35371797297.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/26952ef65b8734e64bf7b56a6119b698/bazomaxilaki.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/87330499784.pdfIn PDF document text
    • http://sns.hu/_user/file/62673711207.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/sanipu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9b9c5bfd---kabolisafikemax.pdfIn PDF document text
    • http://honda-vo.com/upload/file/rusovozolesetuzobew.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/42307743247.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/kabazereriso.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/barajanomirubaxaboxole.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/sibatafirodutivu.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/jutum.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9ffd5f7d4---jitedoleme.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/t7vb9hpvq0j8utsv6t6g2pm2lq/rafilonuxorulejarexemezi.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/01374796814ec7026c13deec851517f2/tabudonixubad.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/1c2f73d37ff61e7838cdf7ed9759155d/64893503912.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/nidoresusenolewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=animiz+animation+maker+apk+download+for+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_02_sfnt_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 10712 bytes
SHA-256: 50befabc389322e0ff5db8a3dd0f253af32455361234aaaf55ac3c7cc37028c7
font_03_sfnt_off00011825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11825 17232 bytes
SHA-256: bb06bdd946593b941f2e8dcba5cc70f096dba058d7a017c8312ebe0c0c41a5fc