Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc84bf424275dd0e…

MALICIOUS

PDF

85.7 KB Created: 2021-09-07 16:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 368b6d3ce6b5ea66c3aee36ddd89c5ea SHA-1: a1cd294e3955410334c09aa540e3f4338102e27e SHA-256: bc84bf424275dd0e60fa7594a4c02b22ea59384529384137c8622ce3d2f393ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or lead to phishing sites. Embedded JavaScript was also detected, which could be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608c775969bc6---82627781617.pdf In PDF document text
    • http://abwlanham.com/uploads/files/7966008225.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d50070655c7---26574096884.pdfIn PDF document text
    • http://htygroup.com/upload/files/92959135729.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/20861127242.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/50012414966.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955731d0b62---28092694404.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda1cdbf3e---jamujapupuga.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/97cdf64d83f32e0a94841fc4db793483/sovikumujezodobosojowafom.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/83317315183.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/81236263641.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/60408347365.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/levedogofanake.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e4a82eefd098ca7230a4b78933fccc5a/vejamebikebenovumazanegid.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/jekejoja.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cc33069f8---konimanosot.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/31422846929.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadbbc6c77---60669731617.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16123ae1e1110d---jadoxowunu.pdfIn PDF document text
    • http://dr-temt.ru/images/file/zuvirozek.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161201bced8198---18981745876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=culinary+dictionary+pdfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/7557302810.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_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 10560 bytes
SHA-256: a7f4ed3da142562d95a6448eea92e329d2a2841eb03997c13057584d729e7450
font_02_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 17916 bytes
SHA-256: 8eb27558d8afa091675fdbe4b1ea0fb8e16404c45f234328afad2b5e749c4bca

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