Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43cc51038c8d864…

MALICIOUS

PDF

98.3 KB Created: 2021-06-26 04:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eeee37d8fe52793406dc4278a04d91e7 SHA-1: 0240cd5728f7df7dca57ce6d8ecc721aeec0e6c0 SHA-256: d43cc51038c8d864e13bd0b8bd9e55e007e6b112dc4f79795aca16d4b0a65566
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely attempts to trick the user into installing a browser extension or update. Numerous URLs were extracted, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://smidgel.ru/uplcv?utm_term=datapower+cli+commands+pdf PDF link annotation
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c26c65ba1c8---72502785228.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/52fa7be76d0af80a08154a41d65cac8a/86341581375.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/fuwesifexafoxolepip.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210613224933027867g4pf8.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/vmhlspcj46dhsp8uhbkmrh9ff3/66206523314.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/59704899590.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65f5fd0a3c---98545065606.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/502a36d71e90b181e82f3ce19a8df0b0/61046634878.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/pprfuvjs83ucke3kdkc6o1jc55/13372441698.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/72119113662.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/tiwibare.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd8f134862---bupimamimopokapat.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b548615734---sogiliferukozudatariduz.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/63342140710.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16075f53ac8abc---pomigoviwazek.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9e62e385b---nelavowetigo.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/65080271796.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/61296772315.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/28827601509.pdfIn PDF document text
    • http://allycatering.com/userfiles/56324774597.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_off00011ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADA 10868 bytes
SHA-256: 790a628734e764c2e60b5880e8b901f4e6d12d0eec8b9b08f9b5ba7f8e1b0fc3
font_01_sfnt_off00013404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C16 17532 bytes
SHA-256: 29ce9a90d69ab8d905c80e48bf2698e37130bc657e7d8e3c2691e10fa735c9e8

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