Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb96339fcd40bb94…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 22:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6202e326311250c2508a3f76cb9fee37 SHA-1: b2414e64398c3bd4120d7693f0a3842242ba52a2 SHA-256: fb96339fcd40bb9436563635a4b6d25438448bd79591ca1286ce9a12c1da72fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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=how+to+draw+a+landscape PDF link annotation
    • http://unsersohn.com/images/file/35225851946.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210921030932485405.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/xononanavizevuderaku.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/81296360902.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/vebimirod.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/94683433277.pdfIn PDF document text
    • http://hflchw.com/upload/file/luwasibuvogotolan.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7bf70c09---motilusiw.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/rikodowikapilasezo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d943f87d---kowaregunokapukotijaw.pdfIn PDF document text
    • https://ka-base.no/images_content/file/4335180018.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614830d061fad---52092823512.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/fepafibumavepe.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/34240193657.pdfIn PDF document text
    • http://soc-in.com/data/media/files/nudilat.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/hksnbg77di0ad49jt57nnuug8s/54419063344.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/41194830533.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0da9c557---39504537988.pdfIn PDF document text
    • http://jar-ted.pl/file/pebugejatexagekoretawe.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/1176700001.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/tamigekozefefutalolifemo.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/saxitu.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/20290451028.pdfIn PDF document text
    • http://school15-tyumen.ru/f/xotuwikulazanefokal.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_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 10492 bytes
SHA-256: 9358cfd9a370914c402177bfbc64d120b0eb540cda40d66ae8c310f9ee48292c
font_01_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 17484 bytes
SHA-256: 8a1df313133bd52ee5150e6ebd11d489e1c16f3a89534d59ced101bf763458ac
font_02_sfnt_off00011c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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