Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94f785fe3d110f3…

MALICIOUS

PDF

84.7 KB Created: 2021-10-31 14:27:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4d9c9e66e95dda8c0dc5b50f8332bb5c SHA-1: 12a23051b084084fa1b887a7069fe033dec443a9 SHA-256: e94f785fe3d110f3b1c03d4d8e64a440bb5ac3fe189ce01d93a6b19232f0ce7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of a link farm on disposable hosting and compromised CMS upload storage indicates a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chandravanshi.com/userfiles/file/2202696421.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/molugowe.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616ade5ccdb19---2605711001.pdfIn PDF document text
    • http://enewind.com/pliki/file/62156130135.pdfIn PDF document text
    • http://risme.vn/files/13637748124.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/98330622855.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/gusazemotawepeguzixutef.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/39003853429.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/rirezewoxa.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///53319335274.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/45922654920.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/87518732920.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1616def8a19154---liwefuxilexidinofaxojeb.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/galofakenomuxos.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/57094596871.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/ruposowigukovi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/noxubizog.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/28547579078.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/15920050032.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/1489520456.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/15190551412.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/575do4tdcdeptvmoek9a76u097/guwig.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/10232158679.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/86242248310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BcFPVxLj4jw/uplcv?utm_term=the+lord+of+the+rings+trilogy+epub+downloadPDF 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_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 18720 bytes
SHA-256: ec57c91e94edf9a71d76aeed316538d0ec93e57550fc1323d3251f21345fb8a5
font_01_sfnt_off00011155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 11180 bytes
SHA-256: 9f0a8b7d27fac673334da4952858b6802ce75ee9fe00474ec34bd12b46c10241
font_02_sfnt_off00012b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1