Malicious PDF — malware analysis report

Static analysis result for SHA-256 684c6114a99d6fed…

MALICIOUS

PDF

76.0 KB Created: 2021-09-15 11:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 756b3b45a137854c8cbf09c6a1362374 SHA-1: 7da519bb4f00965225ddad60168bd9903f2e5008 SHA-256: 684c6114a99d6fed20d852bc279c924f0c51cc60c9fc439f8f5917ae48a72be0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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://huile-de-nigelle.info/userfiles/file/riludovataseravudur.pdf In PDF document text
    • http://tamtamphat.com/upload/files/datusaridubukovuninuz.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/benud.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/nagel.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/jefiwaxoze.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/41265718304.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/93530080366.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7ff9f7b2996b56abd2e75a78c8110eac/xukejavumuji.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dc28l7n90idk2hl67etvmib0ho/jeturisonopevitoru.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613b938d1c2fe---42647720387.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///78994876538.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/72597335356.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210901223807613.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/58987445607.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f705e9ecf5---8103265617.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1507ec9c---47985366437.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/xubuwelovusa.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/26732822541.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/gitubifixibitogigevose.pdfIn PDF document text
    • http://glassick.com/userfiles/file/32668121780.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86669630377.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/kukaragitazodovuxudeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=alan+walker+songs+download+mp4+freePDF 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_off0000c293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC293 10888 bytes
SHA-256: 6ea53da9b1df547bf800b59f41a1d1af5bee40f9f6d4e098deef3db0f1d8fb80
font_01_sfnt_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 17872 bytes
SHA-256: 2280b929a5bdd5d784dd081cbd467c52cded7744ed8e2748e8b25bc251dc5dc7
font_02_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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