Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8e70ebcee8314b…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 20:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 898ba77958e3a26aee219cfd235bfdc2 SHA-1: 5d42413c287071290a3fc236cd992ccc78eb35fd SHA-256: 9d8e70ebcee8314bd0092343794800a4ee4a76a57b0ba2c5cf34afa787844082
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=lenovo+thinkpad+t430u+manual PDF link annotation
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607982a6b0d68---66771238564.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/47249235086.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/15434623162.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160baed4c67758---12304531723.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-6/20210506221634673453.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/73193837087.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/40930163944.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/ropisorumekevafijiwex.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/89617e5eea0c5a503095d659282f6f21/55494195801.pdfIn PDF document text
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/pamagu.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/32868595203.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/fe19lt2l0kehh4gs7lj6d30o0d/getuk.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/48094118522.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/98417958892.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/kufal.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/xubiridox.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/8406816745.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8efba0804---posidezimagixoxig.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/34841334546.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d4e1ae204---meluretatop.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3dc2f86d803bd5c075244f531168df3d/rulofawiwumo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e9834b476fe---wadusugix.pdfIn PDF document text
    • http://vodnik48.ru/content/file/lididetu.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082931c817ca---doxatapogur.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/zejeruwoletokasusesil.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_off0000c346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC346 10976 bytes
SHA-256: 9211e43d9de80e26522952083de437e5e9b2e4c0d6b6ab7e578d5542aad96043
font_01_sfnt_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 20980 bytes
SHA-256: cf0b1759a17efc87a9d73581d4e1f8f3c807120d963cf3d763dee74878d1f88d

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