Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf1d31d01c74cda…

MALICIOUS

PDF

87.6 KB Created: 2021-09-20 03:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3517e9d0f43445a2cb5b491e0822f73f SHA-1: 553c9b5d05d1f29486ab98b0e306ffba18b16d10 SHA-256: dcf1d31d01c74cda1f0b99cdd08f28c8f42af1e2cfb769ebf3b7f9020ef3256b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it's a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a phishing attempt designed to trick users into calling a fraudulent support number. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://licorne-hotel-restaurant.com/userfiles/file/zuremesugufenejiwatigosiz.pdf In PDF document text
    • https://shiokuda2.com/contents/files/66060549201.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/kukubirovem.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/99111767942.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/3c061dfd20e9ca1a3c23df10ed2df387/7821744413.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/juwelaxuseri.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bfa97c31629e6375df29275dd6a5fdeb/movewapomufodoverisam.pdfIn PDF document text
    • http://marketingnews.fr/images/file/75330190837.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109031212484174.pdfIn PDF document text
    • http://charivne.info/images/file/26577093938.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/xafigofavobomud.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/80308428232.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/kafedebapova.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/80657fb9a2013ef4ba6bd09e279fa502/wirefutumexe.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16142571102a6a---junaj.pdfIn PDF document text
    • http://baove24h.info/upload/files/kogapifomo.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/wuvamipagawivikuzoxidiwoz.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/wosezenaw.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/wudokupegipaxotosanab.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/pimomofe.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/28294422523.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c66b01832153a928602b73af0ab45ab7/zuforekibulabojitilot.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1c9ea23dc---bexuwiforaneforifirak.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/85568872140.pdfIn PDF document text
    • http://status.cz/UserFiles/File/29648096670.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f64fa66b44---48361331699.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161467b6577b98---71173087191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=game+launcher+apk+2020PDF 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_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 18312 bytes
SHA-256: 641bbef121743e51724f78cce953191227c21bad833278a135995656398bce6b
font_01_sfnt_off00011fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EE 10636 bytes
SHA-256: 8c1829608e282e074cf88ba022e9f61184a800edd66f7f163f11acda9c1f92a6

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