Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cb09e8d3dc701c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 12:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72daadfbfab6788e6bb9ba733accb5dc SHA-1: 1f01f94f37a6a7333df7ef8dc470550ca7248901 SHA-256: a9cb09e8d3dc701cad675147331b6434b7f82f7521b2d4db652399be21eb3ec8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF's primary function is to act as a lure to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://ore-processing.ru/d/files/gesafizalit.pdf In PDF document text
    • https://easy2ticket.com/upload/files/30180454862.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/79955906791.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346089d503c---41335276406.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/kawesogajamoxemitakefete.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130601daf00f---malulofabetidejok.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/segatexiwuritomoboxam.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/72369821009.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/asbjng48cb0gvnaogtpr39ur11/kefukuzepofojepevodil.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/255f86c98e65f789d9acc7862ef07673/27686394832.pdfIn PDF document text
    • http://gabortech.com/admin/file/25672795988.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/nojukigudezod.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210903123652286.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/14592052771.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/53857166418.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/wotizejafoxofipasujikef.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/gizaluxa.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/viponomowutififidimuzedo.pdfIn PDF document text
    • https://tavio.ru/files/file/denipuvujonazebesa.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/96884941648.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/q4r9msrveevj4dm1b714kbsoqp/88888024815.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/xomemeku.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/86983130837.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6fb4d512b---76750885908.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210909_5AC1FC35391A07AD.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bee+movie+app+downloadPDF 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_off0000c267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC267 10392 bytes
SHA-256: 1b6195d2dea33a6a26d5f82f8c89d89165bff1216d0a83379371e7d6c2d84d4c
font_01_sfnt_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 17244 bytes
SHA-256: 8d22521618b45fa2bd8e18d71e0dc21d26d4e4435d3fee764d0fe48188b51de8
font_02_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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