Malicious PDF — malware analysis report

Static analysis result for SHA-256 097b632442f7f647…

MALICIOUS

PDF

82.4 KB Created: 2021-09-23 23:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51587d8aa5401a47c9ffeb3c5649ea18 SHA-1: 64146f383d8734a08ab8fe697b340465156b99c1 SHA-256: 097b632442f7f64799fd44f8286960c13cc046689e9df934dd233e57a12820f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates this is a link farm designed for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

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 https://laborke.ru/uplcv?utm_term=13+letter+word+starting+with+u PDF link annotation
    • http://nuocmambason.com/upload/fckimagesfile/109db0d03ac7af46117725890e9ba047.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e647a925a---84524359472.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/30302353221.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b7751531026f79c624ff28d89f77e163/mubebofepagomed.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/14184379193.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/53402447623.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/99064966196.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/11312365676.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/99f4ecd6b224ae083dcace8e92ecc617/49559456460.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/weruvimon.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614265161f554---kupifodur.pdfIn PDF document text
    • http://araonline.hu/uploads/file/85412034457.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/63671749219.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/wowekesosopaluj.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/ziwap.pdfIn PDF document text
    • http://mayjack.com/upload/files/puloj.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b8e34f15e---xekokuvegabozuzafolozalup.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/93748309457.pdfIn PDF document text
    • https://fuoriscena.eu/file/18977171598.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/67002441966.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/74937542363.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/61358117067.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/96865568526.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109022147503095.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/woduromalujiwimujifupo.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345aba0a51d---99577469633.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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 10840 bytes
SHA-256: 4fc74a57a0b7c5395312f3c5f600ac520bc229f406f17f74e3663652370e8d20
font_02_sfnt_off00010d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 18064 bytes
SHA-256: 1bd527ceee23a36f280ce153f6efa53328dd9b2d67386bc46333b512e52325e3

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