Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf203c479c03b4a4…

MALICIOUS

PDF

88.2 KB Created: 2021-08-12 02:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 71964992319afd637518bb2c0647b534 SHA-1: ba684f5a64b1f5884111e0a53dc991e9e5e6d3eb SHA-256: bf203c479c03b4a41b8755dca376668045bebcbf2771c09fb0084ec38399d49a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=how+to+make+bracelets+out+of+friendship+thread PDF link annotation
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/8a8133490eda5a1d20640e977a685165/neriguwilajedi.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/42408034365.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/06abd0bc380c7c0e9cc080caebfef80e/taxulewelaxejajufugume.pdfIn PDF document text
    • http://charivne.info/images/file/49380529535.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/rho7joi0g99cvqkhsqi9vrcggk/zitunevuzeguwofajon.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36148904555.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/wusomonafafifawetitoko.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/1v59g8487nas7c1lv38m3edu3l/fuxol.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/303acd4e6fba88396ec0a0d80be84ca1/laxuman.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/52235118103.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b9bdc13b---suzilutupowelizemu.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/pokurafu.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/12443404258.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/kezopamod.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/ziwabefekopezemupinu.pdfIn PDF document text
    • http://sdds.be/userfiles/file/momitokikijodonenonato.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/25d7b06bfba88eec3d88b5840c030c66/wolotixodolubebujeni.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/9734629851.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1ae0052943af9e461b9427d08dd2683f/40925010132.pdfIn PDF document text
    • http://samtekelektrik.com/files/99909682910.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_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 16484 bytes
SHA-256: 1834bdc188bdd5badff61ad36515b8dee0be35d834c3685745e5a6b998e32076
font_01_sfnt_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 11296 bytes
SHA-256: 8198b2762948f7a4ee9fe57f7dcaa68bb12e6305066ea3f50a7a18ceeec88ddd
font_02_sfnt_off000138c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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