Malicious PDF — malware analysis report

Static analysis result for SHA-256 4103f939b7789708…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 15:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4daf5d0db65743b2adb40605428b227 SHA-1: e00a72b96f8dd4c37f8e2f6d036476ee2b34d7af SHA-256: 4103f939b77897082872bd2b6143714bb55cdd36c979d77db4896ef3b24a0343
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to host or redirect to malicious content. The presence of a 'Download' button lure and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pogotowienaukowe.com/Upload/file/39437519168.pdf In PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/48436915111.pdfIn PDF document text
    • https://andrejc.si/files/file/pijegowulawagawoletelekit.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/kisorowanapudurasidumak.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/191fe99caf739fe2ee4f6fa372b98c7b/mevova.pdfIn PDF document text
    • https://ibericadearmerias.com/file/16661786569.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/ridokuvuzej.pdfIn PDF document text
    • http://roocenter.ru/upload/file/3597486251.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/50820872003.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/wujodonazupotizufobi.pdfIn PDF document text
    • http://podushka.by/files/files/20324091743.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/muwerizewasuzokemadab.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161254dfba9d90---mopulobig.pdfIn PDF document text
    • http://freeski.hu/freeski/file/40766399128.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b246533c8df---16266988396.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/85385494452.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/o79gdgi3fqat243knsnpoveuin/8494393116.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/56038464958.pdfIn PDF document text
    • http://atya.eu/files/file/vulirin.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf57dc121fc---jamukave.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/5693828947.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/b72d21b201b46e532a7bcbb3b7c5b25b/mivixebowaworuravaf.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/kulogak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=convert+powerpoint+to+pdf+high+qualityPDF 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_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 11152 bytes
SHA-256: 1e385b786efcd532cb8b30e61a4ced68a13d534891bfaff31921771f363d0c73
font_02_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 17784 bytes
SHA-256: 21aa6cf44262bdb233e2ef1043801bb86208ddc343099ea8eb8909470d5c2a81

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