Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c6c626861d3699…

MALICIOUS

PDF

75.5 KB Created: 2021-07-07 19:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6139fbc5bba69e38963cf126fc1a22e6 SHA-1: 9334cc3357c732cbddf832de9cfa616c3e9671fd SHA-256: 63c6c626861d3699b2298771dec0151a9a3a2725bdef350d092abc217907a89f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://nomylo.ru/uplcv?utm_term=how+to+scan+a+document+on+word PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b20e6e0d4de---xasizowegonadiduwusu.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/kamofuki.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0763638af6---96610431468.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/pajukodovuf.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60c442a2e92cd.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/lujesugugujilog.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/pegatogomezakoripipiruj.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/79596085517.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/nuxamokiwelavased.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/73522962428.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/gakadetazexumegi.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a8cb1c9f504538b96c4bf2cf107c0df7/86807138114.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608064e5532cd---tixerukukudenadotawabit.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166f07add6---zetolezinak.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/58a801458dc138e5b59ff5f849ad902c/fifikinojexarox.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jipinesudegusewom.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/88440036642.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2740216d8---dizus.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1129d42637---sufati.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d6d7e956---zetetinuzugunutodelafu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/j9nlp8odht8c127q1be9t2aju4/24110244924.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/97962642114.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_off0000c6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D2 10568 bytes
SHA-256: f39b4759e4adce4cd7d6309f8c4b18e529a98cede1157422418d840c1208f60a
font_01_sfnt_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 16128 bytes
SHA-256: ee5d24efd2c73ee50d1e9a0e654f1f29ef8a7c6165b72b6b48370d41c11a9950
font_02_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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