Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd1506e0cd30043…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 02:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41495eebb1d0670a3bbf7c6d8afdf2dd SHA-1: 1e3ec43a9d62dda53bd1dac8cc1677d20ee3224a SHA-256: dbd1506e0cd30043c4b465fec0b0ef53ed42b1571a06d730a0a702529f858e6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URL farm and the PDF structure itself are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://ud2-140.com/files/buferowuraninixamuw.pdf In PDF document text
    • https://chupwo.com/editor_upload/file/tosejolitimif.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/susuwinisosoboxedevaw.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/wekab.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/79349686735.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/kajazifanek.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614860531d784---84403778469.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161353dbf2a9ff---6934841001.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/28690134596.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/dozozulesod.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/nolaberujobodotowu.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/tegufarapet.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/jesepi.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/leroriwikupunepebekakinu.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/21427890316.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/74182420486.pdfIn PDF document text
    • https://vientangluc.com/upload/files/panelobam.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/19099577787.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/84616376278.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/22233462805.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/uqeor8q6kjng8jkla3jott14lk/62251345718.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/1083820c88a1d2f0d68ca237195d8ef5/vikesepadikojopali.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/40491967577.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/jemaxaridojigovoduwom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=rupaul%27s+drag+race+season+13+episode+4+online+freePDF 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_off0000b016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 11176 bytes
SHA-256: e72dcf8ad21c23e882d39459174ff87bce10ffc00ab591098fc4bbf6a2a697af
font_02_sfnt_off0000e252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 15332 bytes
SHA-256: 05042fb636025f4335dfdef5f21065056e6a55d2547f56986e53aa98132867b2

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