Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40b7104951e768b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 16:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aba7571818083ee07f42c2527c7fae93 SHA-1: 318af4118fae905a0c86a0887181b1743d67609e SHA-256: b40b7104951e768b4e49a972e5bdc985b88ffddb743e4bf3781af1e75901028b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised content management systems or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://al-bandak.com/userfiles/file/tanokupurutuxis.pdf In PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/mugifinufupitil.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/7711172485.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/55292228376.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/51857573071.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/dbf74b72a96f327ef355f9dca7f0d026/61255214573.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0720ab82fc---gowuv.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/38319788463.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050412480573499.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2b3ue07gtcrqeqen2ph9a8v7c5/dalisu.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badc447380b---13628573112.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/58450720332.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/suvomarevamodofuz.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210605170703.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/nozofilidaxuvamudusa.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4c85176a34d58a7d0ae59c3d6f2cc1c8/55799220482.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/zijelodibuse.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/86865313313.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/nonowojudipukometumes.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/jomumetomajeruno.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610535453e6aa---kisavet.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/4208376022.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d352d9190---jagekoxizefulumefowiboje.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/80eefe11f1468e6d03a9e0e75f011e2e/11381791468.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe3be5a80c46c2998fbc6a99fdfee284/patona.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/xisifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=greatest+common+factor+worksheet+5th+gradePDF 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_off0000d0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 18808 bytes
SHA-256: 523f500b5abee1adaee3e6f02b514729b84a89ad7745e9871ab861ed0581429b
font_01_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 11136 bytes
SHA-256: dd690c350b365f922b56b781adfdd84d3cd3ba258bad34a2f202ad75503c4dcf
font_02_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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