Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5a2d411ffd02d0…

MALICIOUS

PDF

93.5 KB Created: 2021-05-08 00:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5156b758b9a2eaf2da2e766ff04d7585 SHA-1: 1a41f8ecdd208465d1ac9d2f0b719a0871219d60 SHA-256: 5c5a2d411ffd02d0628f5be568f4bb3385aadb1ff5577fc29ce2625c50925cb1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to potentially compromised websites, many of which host PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting an attempt to manipulate search results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f04e1d73---popav.pdf In PDF document text
    • https://noddy.nu/images/file/jedafur.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed794de4dd---weravuzixevevupebusuvumir.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7e6fe160b473e370d90ffcbf22f05e37/98252862438.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/3m8k0h4sd4mjehf3bg9so3md04/8451029867.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606e64abbd1cc---1076766796.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88421333f---6708966496.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/40041e603ff5b13bbff6da0b800d7c8f/tovagawufazoxalazis.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o8g9olevjiirq1rcn654qneu74/nuxemipemu.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/799eb11b2738d6c727ce0f3b59973818/vofozowelopi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0c7906a2e---50974187721.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a5495431c8208381b95963e4b8c811eb/19034565400.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607068ff8210d---fasisekasupi.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/79f66d1d1db6ab1b3ad4e70ae83d6926/78544201998.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/71444fc3586d3478699fb1e6563c12e5/30825117229.pdfIn PDF document text
    • http://amandamaitland.com/images/file/98354980130.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925b6b2b269---28725806614.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bandukwala+game++walaPDF 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A23 3032 bytes
SHA-256: 4d6d6d15a37155d6c79b2754c8f250a97d5f441b34c8c1a4bb1cccf8449d838a
font_01_sfnt_off000124fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 5076 bytes
SHA-256: 1b109b48791fbc9d5c0cb83d93ad2a15df5adedea9e5e121fe4f09ee30282996
font_02_sfnt_off0001364a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364A 10504 bytes
SHA-256: b28d21e0b8e1b934fb5f6f5c8450d38267febc373b2ea4b95ade6e38358c736b
font_03_sfnt_off00015a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6C 3208 bytes
SHA-256: 75e931ee421d606cca27aa06f6fe8e256b55963abb85ab2db23c0f1c3f4b18e4

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