Malicious PDF — malware analysis report

Static analysis result for SHA-256 771db1c90f7e73cc…

MALICIOUS

PDF

76.6 KB Created: 2021-08-30 14:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92c3bb1f3192fa990d2fab863a99263e SHA-1: 3fcb44bdbdbc7e3b7649b16d1d6a0533aef4785d SHA-256: 771db1c90f7e73cc7be592ee0530a7efcf8f584e6aaad5bf2f91aee02d98a29f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier also returned a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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.
  • 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://iaestedresden.de/userfiles/file/37244501749.pdf In PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9a57a1f75---20975669737.pdfIn PDF document text
    • http://mousike.it/img_ins/files/gibimugefa.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/kukoxelujebowakubaxiz.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/29593258469.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/dubefekijowu.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/cc1e0045fb828ceb8bf60ea7564a11d4/revivo.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/85209631185.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/2q5ininl3fv0qv38o7cbb8lnn0/gowapefixeguwilunimeb.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/jozepopedok.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/dusarosisizumowu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b4f93acb---99365143383.pdfIn PDF document text
    • http://willbramephotography.com/pivorofoxofilun.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/13200818886.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/15713102308.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/kigutiw.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210810042541.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/1901563750.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/zukulovonanowir.pdfIn PDF document text
    • https://alev.az/userfiles/file/felivasekezegefekidam.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/41295526797.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af495ed2671---lumivalaxuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=well+done+in+xhosaPDF 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_off0000c945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC945 10240 bytes
SHA-256: cb69fde727faf3453f55bf7a83791d85ef990022b87e023ab08e869e92b7b310
font_01_sfnt_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 17060 bytes
SHA-256: 3ac11c6cb7a176f00fd1efb6cd7d378e4af68ae14b9a4096777ad6f5f34670c3
font_02_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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