Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5312b028917dd6…

MALICIOUS

PDF

104.1 KB Created: 2021-09-01 15:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3272649ff4a00699b8f52389db8bf0ee SHA-1: 6d36f65daa2b8b71fd0f18cae6c9eeff55f7cbaa SHA-256: 5d5312b028917dd641ee8a36d325d1b474f4d389654d2f37a9c0fa1f78e0cb77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS upload storage. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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.520amis.com/upload/files/61235188996.pdf In PDF document text
    • http://sparkpro.lv/content/file/tijuwudo.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/8127533889.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad6471f985---50182122042.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca19eb6ef7---95356317108.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/4uckiuinjms4ut6dgojkvrlij1/36219723919.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/1ecc4bb2a46fef6e67021f8217dcaf9f/jakugefefenim.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/kujodemokitebelipirekarew.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/07e1539c97c34de42327b555d4af2aec/91348428417.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/98551485267.pdfIn PDF document text
    • https://fultoys.com/userfiles/wiped.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/7af4469d4c01042b79d2aac898deffdb/fofivefowumibipudipe.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/5305264255.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a784cb045c6---85275159728.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/59642736017.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079e55c5ae45---juvijomoketutukim.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/40e90a796aac00952ffb0b901496992d/sozalosurakojozof.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/84aodmeuk51uhppho56e5h0aba/87756852801.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/boxubokawilebifona.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/4216460665.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d45da1080---926762994.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/af519aa338a89588a7dc22ccf743b0fc/dolokewadofilatagesage.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/62841240688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=500+dollars+to+russian+currencyPDF 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_off00012bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC4 10736 bytes
SHA-256: f5c8a46c860893dff362c4ed01c46c7012c0de8aa878b1f7ea3869a8f890bdef
font_01_sfnt_off00014497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA9 20484 bytes
SHA-256: 06397ba02b4f13efe3468c7dd992e1ada33bd9274f906e297547d2cd069eec1a

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