Malicious PDF — malware analysis report

Static analysis result for SHA-256 2846799072a8b5b7…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 16:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d279bfa9546139c9409b4570513c8bee SHA-1: f8f8e920ac1899f2342eb6cef3dbe8b5120906cb SHA-256: 2846799072a8b5b7fa5d50d9ca3eb00f91fa829522d270df73fa53da57f48d77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=exploring+positive+relationships+at+work+pdf PDF link annotation
    • http://shinies.ru/img/lib/file/83160408524.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/rusomajobimili.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/bojesobogagarogibewepir.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/83121403715.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ab662565379f6ad7994a9b68fc688ec9/38890629455.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8ff265cdbb07f7956ede5e261c275eda/37026898353.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/pazik.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/12749433097.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886c975e866---bodabosewizepav.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/6643939289.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9538395c7---15985486800.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca201e321e---86721877405.pdfIn PDF document text
    • http://weingut-suppan.at/files/zariwazanosasuja.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a6bc34639---10330976168.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/davojedurobodubofefaxu.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/wokosimenibopafekefemin.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/mizuferalutolomoru.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/jodaj.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/83931009422.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ce48c3e5---jogotoluk.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/802dd1e108bf218487f87751a2b70ed6/37246872903.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/3769382647.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5405e012f36254e150b6afa009784f15/lazix.pdfIn PDF document text
    • 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_off0000d866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 17544 bytes
SHA-256: 83a5fe329424b1d970dc971fae570bd88ccc5391e8143d0ff358817832e2bcfb
font_01_sfnt_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 11104 bytes
SHA-256: 53ab05f0aed6c6df6551aadbc115f62df9e7cdff1b15a9bdbeeda5953dc47435
font_02_sfnt_off00011fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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