Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86550ef8b312e43…

MALICIOUS

PDF

140.2 KB Created: 2021-09-05 16:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b835a18c879407f125bfab9b35ece10 SHA-1: e9535c21e64f912af2836fba76ba5bd01f767519 SHA-256: d86550ef8b312e43ea2e7dd126ef4dbc6b7f5dc186de23869cddf9ba01fff1bb
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malware. The presence of a 'download button' lure and the ML classifier's high confidence score further support a malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ip-pharma.net/data/files/validipekupuba.pdf In PDF document text
    • http://mcutech.net/upload/2021/06/file/16232945591550457055.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/59174550815.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/bepogawewavatazotubefuwan.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210818083258.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021082317123723.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/malaxose.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161349532d2bc6---dagudulerezepowit.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a704b40d8ea---64394008354.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210807052750.pdfIn PDF document text
    • https://tavio.ru/files/file/34382629939.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210903010316.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0eb1f2aed---rikenoneludar.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/nuselavazusomalivowojiba.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/93831714342.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607624f41464f---tusojeruwudamofatixivur.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/77597956821.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/70458254684.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/46525330809.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/33417927462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pit+boss+820+owner%27s+manualPDF 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_off0001b9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9FE 20832 bytes
SHA-256: a4803cf2937c71989fbcbb574efd65041f3653500adf1e49fd52215a883a7791
font_01_sfnt_off0001f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0CA 11080 bytes
SHA-256: aaab69a983859052bd07ae32926c0bc92d73c795762f22e738920de5850b4ffe
font_02_sfnt_off00020ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20AC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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