Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d642e71f931c939…

MALICIOUS

PDF

90.8 KB Created: 2021-10-07 23:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2f1110a69b6a5d87ba3ea125cf7807ed SHA-1: 3f434a3491c226da20c21ff8504bc1867e1154d2 SHA-256: 0d642e71f931c93963d3f20250115dfec6202ef576cf3f3983a06fd597325484
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the execution of further malicious actions or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ceresasrl.it/userfiles/files/zunamerawitewodufa.pdf In PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/xipotenuwuwokub.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/54426402601.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/kezajewawawanubovit.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/zaretufogusuziregu.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/33362914655.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/84092527611.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/92967464070.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/rubenuselivados.pdfIn PDF document text
    • http://iphysiology.ru/upload/xexuvot.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/88e06dd7351929c9e2558bc5b5dbbac6/3117809572.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/somoxunatiw.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16145bb2e34c2a---92499896602.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/mudonelegopisikub.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/kinovamug.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/budirinifotapupika.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/sesuvubame.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/59855631533.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/d5edcfcfad8d35a78ecb30df70acbef2/nukakadijusizubuzibemer.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/fidivowomizebakokaf.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/15140595378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=wife+sharing+on+the+beachPDF 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_off0000f9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CA 19920 bytes
SHA-256: 5daca47325be1d4a0eef8ccbc5ae647ceb1a18552dae44a8173d1a9b7833304d
font_02_sfnt_off00014553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14553 10704 bytes
SHA-256: af650d27a37777c9b099471a75c78f96db31d0c4b11ed577c625162609a4dfc0

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