Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71e64900b80b9a7…

MALICIOUS

PDF

94.2 KB Created: 2021-08-23 10:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39fb639c8bc0f5a0f3970c885b8ced24 SHA-1: 9f52398351c7d0faf09c77dd2d674797554b5479 SHA-256: a71e64900b80b9a727ccb6d5d68bd7c7d122824f25a3925b73d2908e1083ae20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains embedded JavaScript, which is often used to execute malicious actions within PDFs. Furthermore, the PDF exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/d5he7eqs1jeanq42le3kdittl6/zofev.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607585fa58251---watidefido.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160915ac42bc3f---miluxalupaposet.pdfIn PDF document text
    • https://tipresentoio.it/images/file/88303813226.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/14771902598.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd6fb4bf24---susasiwibofunu.pdfIn PDF document text
    • http://texmet.pl/userimages/file/pisojalewala.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/2871347744.pdfIn PDF document text
    • https://badoza.net/userfiles/file/zobituka.pdfIn PDF document text
    • http://usmleworkout.com/files/file/vepaledifukezujiwavabelew.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/bb68cd45eeac62e62d718b686e441716/zanukibudakalo.pdfIn PDF document text
    • https://aspirans.com/files/file/pagibew.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1e9b58f62e5360d0409706284c0c2314/10675248550.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/umldns399q08dnc5svdt3kpm1d/96389670781.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedda20787e---73687235603.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9ed3c19c89f25ca8d6dea0576a171f4a/zerudaduwe.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086826191e5d---29412443302.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/zubarexifaxip.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/94990396569.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7fa0e6657---zokoxetadunufozinazenexa.pdfIn PDF document text
    • http://davisnewfoundlandfamilyreunion.com/clients/60627/File/wakexajusuvigef.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/bewibuwu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af93855cc91---buserizum.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d3f9023ea---84180292765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=melody+definition+in+musicPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001243e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 10584 bytes
SHA-256: cee55ce86ddaf1619467bd7f87e2e61fe7a9bddbea13359acecdcbdc61f2d549
font_02_sfnt_off00013c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C65 17568 bytes
SHA-256: 630b2a2c0dafcbbef6d557e1ab4e709dd2f9a96b5c749e79718fa0ea8efdfba7

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