Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f218a0342cc500d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 20:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0eaa2641e3128882aa95f7ecd22ffc13 SHA-1: bd9f3cc291eb3abdf7c19840d382d1b566d94a11 SHA-256: 9f218a0342cc500dc9c9d3edb52e87ca622fce1dbc23ae589fb1e394c88213e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://drafthe.ru/uplcv?utm_term=articulated+dump+truck+training+manual PDF link annotation
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/39201458259.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/56227144245.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/viwegiroxevorageforefo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107bf0537f5f---14723513082.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/390173033.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770d701e2c2---zitonulenokif.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/48491615499.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/losorowas.pdfIn PDF document text
    • https://digireg.com/upload/25620296208.pdfIn PDF document text
    • http://classtool.info/upload/files/40552640923.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a433a8ce---pofezetopimow.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/31849459631.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/57295323465.pdfIn PDF document text
    • http://insk.ru/img/userfiles/file/71554282911.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/lefuzavunurewewanagov.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/97576341107.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210623_E9162C8CA34E14AE.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/71duhq45ervnee2ptkl6ngpohc/xabasuba.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/51456310262.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/wunax.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9da776069be9c19cbadac403387c1e66/33635741157.pdfIn PDF document text
    • http://szpk.hu/_user/file/kaginusoz.pdfIn PDF document text
    • 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_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 10740 bytes
SHA-256: cab23a08e4a6e552ec499ae8618589f4954a8f921d9df0b488e20684d963c96d
font_01_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 17388 bytes
SHA-256: f2f9428c790f128891935b1c4abe1a771511f4af8e5692e3e21af9cc8fd950bc
font_02_sfnt_off00011d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1