Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7889615a4d87b61…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 18:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: edccef5c1f2c810e3a0f97a486850835 SHA-1: f8d5a655fff6052d58c4336edd2a840425651fd5 SHA-256: e7889615a4d87b617016e1e90765bd979b789b0e29f47972c6828111da603463
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a link farm, with numerous URLs pointing to various domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://webshopplus.nl/app/webroot/files/userfiles/files/guxanowebub.pdf In PDF document text
    • https://floresdeserrezuela.com/aym_image/files/lisosedugevekizesoxij.pdfIn PDF document text
    • http://askort.pl/Upload/file/mimasabekajiropugijebu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613efe2a7c6af---gijuzodobuzox.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210910233412.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/14665765997.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/tepuvituvivuxejubogawulav.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/janigozo.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/diwemimiweweg.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/22000225490.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/wosenir.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/57247301879.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/gofetewusubebiraxexof.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161433f163b257---pegenexenepakawowinero.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/puzelixavew.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/dubigebem.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/74637105155.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/nazuretuguwurak.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5037ca92263ddc1772ce891a7c9c8069/95410613724.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/50297627230.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/fikekijikuturaxi.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/sifomolabo.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/tavexowikamivojazok.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/23967704570.pdfIn PDF document text
    • https://btegypt.com/file/65453647482.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/27592334278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=friv+classic+minecraftPDF 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_off0000b2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F4 10420 bytes
SHA-256: 9a089ac4efd43c2c23a98219dbe7c347a547f323b87bea2c29c645d7ccf5190d
font_01_sfnt_off0000ca88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 15964 bytes
SHA-256: c4c42cd14c84bd7898a9636e14073de96261fe68ad097554462d57e58734c2b1
font_02_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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