Malicious PDF — malware analysis report

Static analysis result for SHA-256 0057576630eb9a33…

MALICIOUS

PDF

91.4 KB Created: 2021-08-12 10:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: caf2a557214333d82d188b5ce5769360 SHA-1: ddaac76e3ee5e9fc2b9301771cc6973e77e4f44e SHA-256: 0057576630eb9a33dacef7f1527b6e386fa9ea301a8be415bf2d504c96dad911
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://remaining-mc.de/userfiles/file/4631443528.pdf In PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b82c5e149dc---faruvujapevak.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ckapcuqsdi55574ncc21ufb7pj/44484710906.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/luziva.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/zulujosagimofakagaj.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607854e8e76f7---mivenofob.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/lofuk.pdfIn PDF document text
    • https://dineflon.com//files/dikop.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/wojaxowal.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///39760299053.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/zosotixawewixetopisekuwu.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/aefa4968aab46e2e541d286296a9c1db/sonafu.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/74613618804.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/h6a7up34v2r64ds8mjne3m83ei/fozuxupedurabononaja.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/j1fmoosv40puviv4vjcm7mgopu/maletexerigepituv.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/62291052423.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c8a098916---13095332776.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/59710429176.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bipofuzazesovemideweduk.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b049e3ae0---83393131779.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d806a1dc1de7483d100feeaacf793a17/70214287396.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/gakalawarupudefe.pdfIn PDF document text
    • http://k1a.ru/images/files/file/xosarufonigaso.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3c45d00a2---31388949801.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/godunokalopesumutu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c853c5d5ce---90457340133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=where+to+put+tens+pads+for+upper+back+painPDF 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_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 16700 bytes
SHA-256: 4a102467f28823920c373f5720028262b5c4dbd3bbb34116243dfc4ace51e97a
font_01_sfnt_off00012d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5A 10996 bytes
SHA-256: c82b9187f0ed166a9d057ca7deb3066c4c6ecea35f5ac487484f731ffd7059d9
font_02_sfnt_off000146a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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