Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb2cb82f445a19d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 09:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a92e3d8021476ea59b80b4ca4c85680 SHA-1: d2abae11551be5d29cfe45b0c9e1c8251b6080e5 SHA-256: ebb2cb82f445a19d730ac9daea0a9be4f3613b94088cdf6ed1b1582656a72a31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c8cd33dd---78643841937.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfbb56166e---kukedurenaw.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/zapixabexipajibemevetad.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/tixigesiripa.pdfIn PDF document text
    • https://loctra.net/userfiles/file/38367914387.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/74170684250.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140816306901---60847791037.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/df74cf05d87ca9338877295fe81cfd9c/6366353930.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/bituvimexeligurunivin.pdfIn PDF document text
    • http://chapelguild.com/images/usr/9968372342.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ubg2env8ufn22pjee0mkr06eh3/tatevexerokuta.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/78167525148.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/vesulowipawulorevup.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141443543b9e---pamapijuvalozuwamib.pdfIn PDF document text
    • http://355353.ru/userfiles/file/80487910730.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50553675926.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135756b2e9bc---nazasinafo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/badee10bcbf08c08f74ef8ec56e3efd2/dujuzuzinivi.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/wimivilusujanigabokalup.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/wakujaripokimo.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210915141147.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/laxukanasamijudasalu.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/wugizojuxadipubadebumu.pdfIn PDF document text
    • http://373113.linker.tw/files/xufixibigutefobavuxuvev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=vanessa+hudgens+photo+scandalPDF 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_off0000d4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 10672 bytes
SHA-256: 2a3bc98a7ba15ae81e9f3635bf28ea6536ad78351ddfb42328c2f6b7c7d183e3
font_01_sfnt_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 18584 bytes
SHA-256: 0fe014b9d3fd1c636e2e980a954f21b9515538c57bc2640566a5e7708acad654
font_02_sfnt_off00011da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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