Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d123d810c48b30…

MALICIOUS

PDF

89.0 KB Created: 2021-07-02 21:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1f5b1b2fe3360dd50aa9fe239b2600b9 SHA-1: ab71de02e8eca33714b5ba4a6e581a27b6fab2a1 SHA-256: f6d123d810c48b30db7b75f903cb793cf435f9043452fa45fc1ef4fd56236376
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of multiple links pointing to compromised CMS upload directories and disposable hosting suggests a link farm designed to distribute malware or phish users. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7ee4ddf3---somilugegapejatanativezaw.pdf In PDF document text
    • https://abofahed.com/userfiles/file/riwojaxikepel.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/o0ntgbih6qovufl1stri893a2t/rasifepununiju.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d53ab17d---53186962705.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/77e87efc2404615cf9cc1de068da9f86/35964745805.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd00a9609---29556584361.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/43034874538.pdfIn PDF document text
    • https://atl-50.com/files/file/24884442025.pdfIn PDF document text
    • http://susutour.com/userfile/file/xevativixa.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47e914806---99836380994.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d29bc4c54b1829bcef0babbcd40a356e/25387543771.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/9a840853c2a508dbf694b55b724bcd1a/sizewe.pdfIn PDF document text
    • https://atl-50.com/files/file/sopetomoxunuzajibevo.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0cce9468f1ae6262596fd645f4f4d99c/bidixuxon.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094310457df0---lebixiwusawarokikumo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac489f3570---63593456836.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/82346648112.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608697aa3cb37---lowidejutakedowigo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab9a86053---15890210235.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/11994764203.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/af86bbe46ac8bcf62588ff9c1971cea0/96721574500.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210503145016.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ba3a34fbc---42850970133.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s965dv4efqbshgdnp2pr0qnvkg/72315942686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=free+printable+giant+paper+flower+templatesPDF 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_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 10904 bytes
SHA-256: b0d6cc55e103edafba833131177adf7c9bebd61e94a794773a201f355169b2dc
font_01_sfnt_off00011231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11231 17020 bytes
SHA-256: e3abec2af52c04714a8195db22d5b957c3d0209db52312092274f5a3a342c700
font_02_sfnt_off00013ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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