Malicious PDF — malware analysis report

Static analysis result for SHA-256 863f0bea959f4fe9…

MALICIOUS

PDF

79.7 KB Created: 2021-08-29 01:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48fd014749455065436c3b852e242260 SHA-1: 8cba9deee856ab3f22b196e824fc0968d78ba310 SHA-256: 863f0bea959f4fe973cb6da375cb8b8a44a21ba5880b54f5634978f1b0707523
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/96740488150.pdf In PDF document text
    • https://ljlconst.com/admin/images/file/wumam.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7b3e7856a---suzaduza.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/bipabafobidutitumelidoti.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc54010c30---97656471427.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/37496903528.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/59436274022.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a388deb294b---ripemamuz.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/pak21pmmdokofqfodmmuk3pdfno7h9ik/wujokisokawubeguxefut.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/80742929718.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/pafusigukivejud.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/sodogurimeda.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/77801834893.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/faca26a5e511dec6e880024bd7ef0f4c/talavurelewudod.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e00d2d261b---57468190878.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/faxalosasaveru.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/72800996238.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/9176984901.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/60269238068.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6f967f908---51245017907.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fab756bf07---kufusirunavojiwa.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/sonex.pdfIn PDF document text
    • http://laserinnsbruck.com/static/38702258624.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1djen203n71q8r7e2smf285qnb/vabibuvapuva.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/28495224447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cucumber+is+rich+in+which+nutrientPDF 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_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 16816 bytes
SHA-256: 03f2db4b06965a15277b5cba4c84243f2f9b0623cea853816216b2b7886b4acf
font_01_sfnt_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 10524 bytes
SHA-256: 1dec38549a83e90b9f1818fe485025ccd9d098af7128c3f0f65e1194c139949b

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