Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c032093d3ce0ee…

MALICIOUS

PDF

84.4 KB Created: 2021-08-17 06:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 46fe8f8b419e680c56b9688f4a99b216 SHA-1: 914c410bab3f44c976d31b7b69981c04c3376eff SHA-256: a7c032093d3ce0eeba50fd1d066c1bf965e0b3fa7c7fdc0b155379fc824094c5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to host malicious content. The presence of a 'Password-protected archive handoff' heuristic indicates the document is likely a lure to trick users into downloading and opening an encrypted payload. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dochoiotovn.com/uploads/userfiles/file/53394640097.pdf In PDF document text
    • https://alutat.com/data/file/romumape.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/petomijot.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/vesiwidisepizus.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/49683349928.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff9dba2797---nukeluv.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e3e5bbc80ff39548d97c5d3f1ff6b154/wigavefigigu.pdfIn PDF document text
    • https://sinarwaja.com/account/files/27887503370.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/takemopumofaruxadi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa6449655d---80912461744.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/muzabijuruwoga.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad478948ba---18820096568.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/paqocsvu6249jsrqfsvm13e0eo/61617575161.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e22b760d2---midoxovofip.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bf603d836---70227610123.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/95777834291.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/ronapaduxaxudizomine.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/10140133716.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/boxetijoledorejuxunajed.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/zatasuxegodalagabu.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/26042650625.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/dugepemuniruwumoponusoma.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210625234426-selitabubexufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=free+download+keygen+for+autocad+2014+64+bitPDF 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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 17472 bytes
SHA-256: 2de8ca4ca6f23cbbec41cebbf5a492d3f68c0b9578ef6154c491e36fdd3d05a7
font_02_sfnt_off00012864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12864 11532 bytes
SHA-256: 80943a0317569acd8687a48b5333bf354825524179bec49f1372922a9d5ff83e

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