Malicious PDF — malware analysis report

Static analysis result for SHA-256 502b4a108fc9fb2e…

MALICIOUS

PDF

89.7 KB Created: 2021-06-21 07:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 299ce35ee44b54b3b98a06e5097f00ff SHA-1: 49fa06366c8eee69dc27ab422b9c4acfa564e6f6 SHA-256: 502b4a108fc9fb2e571b64300ea50c625dcf25b01e0d32a2e26ff262229ae7d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/d32255e3e49b7ec9316f9362bb806c1e/rajubi.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/0ba869b22eeadaaaf22efe7b1ca1722a/memufesefazejaw.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092e52ab6c59---48812109818.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/jitetalinofisatezuva.pdfIn PDF document text
    • http://safetypath.net/cms_images/gezijumunelos.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a114c837---24796952336.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec62859bde---92728479092.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/55506980136.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba134ccab83---52780218057.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c63ce0f91b7e96497f5e6876fb14d7ad/81741607316.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9901d27f7fbad61f9b4dfb730850affa/48058745981.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792c30774fe---jazaf.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/33661695088.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/menudoxeve.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/5eb23905dcc9424e2af891e85cdedee5/67054972233.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file/%5C/lewefosigapupalava.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pitch+perfect+2+full+movie+englishPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 2988 bytes
SHA-256: ff7043a75879f0c79b51f0b03cdb08fb8d78550efccea71092d33c2cc21f6589
font_01_sfnt_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 5412 bytes
SHA-256: 7d78b288aa331ee40dc6cf39fd7e171e6cd3efca4c52cbf2459ef3847c58303a
font_02_sfnt_off0001186a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 12056 bytes
SHA-256: 92ff78b20287b767b5545cd5f08f7e4a01ea8f7f04208536af5bfe949e875bca
font_03_sfnt_off000140e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E7 16344 bytes
SHA-256: 850802d99af099727b60dab9a4fa1a7d13f8fa7f7d706c6d38145eceeb8cb5ea

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