Malicious PDF — malware analysis report

Static analysis result for SHA-256 12dd8421fbf44c42…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 10:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa521a6e1332abce9701bb41e4638428 SHA-1: 7a7344ec0593c06df1437defea96e55e3209ebd8 SHA-256: 12dd8421fbf44c429ecb44f6fd6f46917acc6ff6b93b4d1f1a1d36b853182609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=causes+of+right+eye+blinking PDF link annotation
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd09dcf312---94721017834.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ad5282ba3---51526553830.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/latizenagiwimuxidesufix.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/dibugake.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/66144564659.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/nifonedupebi.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/somalufubogipaduzajopodif.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ea71e65aec88561a4175131e05c83643/48692354831.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/pubefuzajitivokekuzokuver.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/26546312158.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/didirawuxix.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/xakazofefaloziwodidutotu.pdfIn PDF document text
    • http://teraval.cz/res/file/2196863271.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/firadexejuzetasufa.pdfIn PDF document text
    • http://mp-journal.com/media/file/xizosazafawisefa.pdfIn PDF document text
    • https://pichsas.com/file/5628195833.pdfIn PDF document text
    • http://maksimetall.ru/files/11187366655.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/44210362603.pdfIn PDF document text
    • https://shidoremicrosys.com/media/peginuvumufabi.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/61114725832.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/51421969278.pdfIn PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/2297616452.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/75040365560.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8629eb2e567f69ef4ce8fd6ed3a4cbe8/gevozixojupejavinotezofo.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/57426949801.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_off0000df45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF45 10968 bytes
SHA-256: 250251d0da7798e552664721cce6cbfa6ec3513ee1d0fc41d6d35fe333dddba8
font_01_sfnt_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 17300 bytes
SHA-256: c1dde74a6c0a051a7c1ba5cc3b3e788cc738a32207945c5c2611c4d4026e68e5
font_02_sfnt_off00012581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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