Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75673b9f3b1302f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 02:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 98c4de40b8578da6c7c361fc5c623ada SHA-1: e6c385b746230b6c7bf3a6a322f43459e68f9b1a SHA-256: a75673b9f3b1302f2f390a4b75e8f35b46d550ee29924b3661669f1c6ba924a7
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1da23e12d70f3843252fe6e9ed144a90/fefigajufomina.pdf In PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/zuxakonoxexetik.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/97620571278.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/krq7ivkuh8jl2fpfh0lpuuqob4/64179783996.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7475516fc2---venesatokadidemegopumur.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/wigesufuk.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b33d445f2---gigozunapo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609878a3e6849---57897684402.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdca62607a9---gakipadeg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609477aecb816---99640766968.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/simowukidafaraw.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/843a73ba2058ff3ddd8467d17ddcb9c1/fipuxixav.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210705_465202D3415FFB4A.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bca14f7660a---mexiwab.pdfIn PDF document text
    • http://naucseto.cz/storage/gewizewefusa.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/72341997909.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/jibefok.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/sejilulipanozimerakakudi.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609e236ca775d---kurelumowojafugule.pdfIn PDF document text
    • http://primaneighbors.com/userimages/64502975534.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/nosokotekivokelikotejezug.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/rugilovowigekorudubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+retrieve+deleted+conversations+on+instagramPDF 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_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 18700 bytes
SHA-256: 4a2ffe196aed9371d325ee7cd1849627066be40b57d01aa15c546d5e5fab434b
font_02_sfnt_off00012930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12930 10856 bytes
SHA-256: 0533f4856b5d81b161678993a2bada7a996e7f23601e99e46fd694a5d2c958d0

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