Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4333d9a321f9ef0…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 10:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9fee560390a9b1569fa3d819e76a5346 SHA-1: e6496f5d3f7f8688951286b7a53e612d54abf809 SHA-256: f4333d9a321f9ef04b028a0639acfa59f1a64ea241efa697de38aa2a31939644
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic and the presence of numerous external links. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The embedded URLs likely lead to further malicious content or phishing pages, attempting to trick the user into downloading a payload or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://archism.ru/uplcv?utm_term=withholding+tax+on+commission PDF link annotation
    • http://worldofpacifiers.com/editor_uploads/system/files/95971236377.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/7332652014.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/25585659210.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/42329194631.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/10/file/20210610_113502_102.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5507390ee---728881194.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/31529428276.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611de48f61248---10691216328.pdfIn PDF document text
    • https://ancoraeducacion.com/images/wivamevabuvawokiziv.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/59447804134.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/wogutikejimavipirurusifix.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/vivitexeruk.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rogelijewobaxax.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/g5sbgt0540j9qtp06bbu4m3gjj/95087831743.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/16695927586.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e3a59331bca78b660a2060a4dbb22ebf/31907742936.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/gotojo.pdfIn PDF document text
    • http://kaies.net/upfiles/file/kunomivorid.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/65016177979.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b935b149bdd78d3ddbe37969bd625e32/zarurunetikuvarudeze.pdfIn PDF document text
    • https://naoshima-habitant.com/61796836620.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/paxatesigama.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ba2285bfad6f4c869bf2661ad885d1d5/47268519181.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_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 17036 bytes
SHA-256: 5474fdb313761f05d25aea930a7e3701239a47cb748c7ed6e8371843f062feba
font_01_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 10680 bytes
SHA-256: 653aa9abbfaaba2a50cca40b60d40efd018abbde302b6b6d0d59bafa8dd0dc1a
font_02_sfnt_off00011fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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