Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d11847abca0cb9…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 21:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45e87f48b0357717cb0d04cd1bac4832 SHA-1: 4c9a09ad6918091758b4c24aded165e92316e035 SHA-256: 33d11847abca0cb92373ac2b3966a7e89a580b7b77d50734723fbc3f585c78b2
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to disposable domains and compromised CMS uploads, indicative of a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://hzdsbg.cn/uploadfile/1630783671.pdf In PDF document text
    • http://kxnjl.com/userfiles/files/ravevidedobofa.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/gulalarimijakilixevozofon.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/626ec5505f81fd29995ad77973fd3786/nukozobewesa.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131feacb79d6---dulekizisanalazesu.pdfIn PDF document text
    • https://harmony.im/userfiles/file/74982274932.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16136f9f1630f3---84942578974.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135210f04274---11278853264.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/71646151900.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/13139763929.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/fee10026026518848d7a6cf25a34c096/sesowarudufusosapuruser.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e963e7b5b31fb9ed203074353b7604e4/xamoxebinafuratoliju.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/migawivamux.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/03261662bb61128a18cbb2c6f5b705ca/retakukinizidikikotiki.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/47676745626.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9lsna99dv1geu387fct5ltpn27/57483860357.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/49593997421.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/votetilizefosurojetojalun.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/91760400610.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/31281066872.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109021347251005.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109100624551373.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/jigixitibofixadokasixo.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/46094902325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=kodi+old+version+apkPDF 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_off0000d805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD805 15060 bytes
SHA-256: 32320e568e15cc551e43bcc0925add7153c6ab0615553e96ce9f14f0f8c9cebd
font_01_sfnt_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11640 10436 bytes
SHA-256: c42c26b973040161e12eecce5daad26060ab359581a33e7ad05172e759e81cc1

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