Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb85b24cbaaaa85…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 12:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 38860dafff02d451d03bb93ac1b36a84 SHA-1: f25e6ba19e5ac7b0173addca6ed4788c5f1d7f14 SHA-256: 6cb85b24cbaaaa85628d183f5150982b243468f7838a17679fb0c78a98e5ca66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=los+derechos+humanos+historia+pdf PDF link annotation
    • http://vladjurnalist.ru/archive/file/18243565594.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/14739303244.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab0fb72189---wubobatimubizexumonap.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/oljdb20tshhmud1uhn60rodap2/biduxak.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/17051146438.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17a774fcb8---13020629404.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/vivoju.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8c6fc21cfe5eb1e2da7be7cdd7d1968d/zedofigolixesajewetufi.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/vakarinezunurekekamil.pdfIn PDF document text
    • https://tpk-m.ru/files/file/84202475034.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/30751388986.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/40930389827.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/monalo.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/35626185387.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/juzogenexemadofupavo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8b93d5b92---20834705492.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106282146009716.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/26112529200.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160753ad4e3ff1---batumigu.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/91714632776.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/fudeteduxasumenifadimudu.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/retefasejewa.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///1340529458.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_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 10896 bytes
SHA-256: e0a52365d9d7a963635d930864073124fcab774a514c8fb9429ec2a536862968
font_01_sfnt_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 18060 bytes
SHA-256: 3e7b24f4df925ae5e555ec2e20463a5661356903e311cc7d985431c77b27112d
font_02_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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