Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6e42467e4cc15f…

MALICIOUS

PDF

92.5 KB Created: 2021-07-31 17:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0dfd6961fe15a656fd4c417652b21195 SHA-1: 58a883fded5b43cfe56eb032ff8ab9239aab4fa0 SHA-256: 0b6e42467e4cc15f7865bc7a2b74f5e4a3bf206768b710acfd797e37984d03f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or redirection to these malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a2ea9b6e8---sobupozomadesorozig.pdf In PDF document text
    • http://myqself.com/upload/files/20393418000.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782d43cc99d---jonuveporajazovamu.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/35702335463.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210703_950F894ECF941AEF.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/86006044219.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/19837976843.pdfIn PDF document text
    • http://slsnn.ru/content/files/rorovojanivuwuwupuja.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/l41jct8afna9qpmarecogl32ks/maredafowuduz.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3b2ee8df---5239442932.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/63201047784.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/51447237362.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/kibebegazuwa.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/nunisofufusubabu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d06eb518e---logikawonopogisijolasup.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66c52e939f---banafuzenaluxivemiga.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/2e0cbd76b5acbaf2ed1d001f507fb70a/35775435925.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/91567817681.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/jijekarobutagefika.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/7sait50kbs5d8n7is9potsbs83/45344413741.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb7661d04---sanosikopunu.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/e3e1666ad0d6a1ee89201ee7ea4797a6/6109474955.pdfIn PDF document text
    • http://etre-belle.su/images/file/lazowun.pdfIn PDF document text
    • http://yoron.net/up/files/buwez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=descriptive+writing+autumn+forestPDF 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_off0001079e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 16488 bytes
SHA-256: 17e90f5c3004064dcc95b5dbd91cf9c8e892e79138d951fdc7f8eb115b998553
font_02_sfnt_off00014a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A07 11028 bytes
SHA-256: 54d12adaff51a7a7f09ec4e538ca11f0f1d44917b4b8cb5742e0b524bb4a6bdb

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