Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0415d77a685285…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 05:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 54539faf9397b870aa9e4f37f4ab5e48 SHA-1: f716b099d376659d9664cc713816090bafbc38e5 SHA-256: ce0415d77a685285d8b8643a2e05ef28d740a65de12e579bd410914c8482e84b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It contains numerous external URIs and leverages compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics strongly suggest a malicious link farm and potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smidgel.ru/uplcv?utm_term=jdm+car+games+android PDF link annotation
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c2b73991---69181443496.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/78898971706.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/pipupazig.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/bumov.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362b72ca787---59481558013.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/kopugofanijejaxu.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/87487778105.pdfIn PDF document text
    • https://novitas.ro/files/biwuvagubevimivuvatebaz.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/fuwifiderutebevuku.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/50509991358.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/ximovu.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/newutebifewasuwagotiv.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/sevijazawa.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/32693451789.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/luvuxugomi.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345d43b54e3---98315625925.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/d5c2eb13bf5900ecfc957216649dd274/8166978541.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/gijezaxonodoxagevafuxab.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/vawupatuwizimalakufaji.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090604301318796.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/tadugopirusedu.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-4/20210904022717645253.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_off0000e198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 17892 bytes
SHA-256: 312151bb06b20fcd517aff48fec60524d29e98382369119082f2b1853b342bfc
font_01_sfnt_off00010fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 10560 bytes
SHA-256: 306d58ae7f8e51d24b93bdc13e7a699fbecc7c22814e7a1bfa54b8b3a01bfb10
font_02_sfnt_off000127b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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