Malicious PDF — malware analysis report

Static analysis result for SHA-256 39717548eb7d3d9e…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 23:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a140966cb2825a7f703ea1d914b00860 SHA-1: 25143b00fe37c59e2447ceb347c64d62e8c07662 SHA-256: 39717548eb7d3d9ece26ec4efe2f2a6643bee20b44793513870e0e593c7c9940
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users to malicious content. The presence of multiple external URIs and compromised upload links strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=group+the+osi+layers+by+function PDF link annotation
    • https://yingzhaoliuart.com/upload/file/mekewapijusexazoxa.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/7q957ekt8dpfk0h2o23tlj02li/xazutufomaxurunojil.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8d49ec1ef7e86cc266ec4e123ef1ceb6/81603365503.pdfIn PDF document text
    • http://pasaru.com/upload/files/vopogezowulogaj.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/midomevexelagubudoki.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/68318838139.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/73761986758.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144dbefc8f44---37271658414.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/59058142658.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/rebibolika.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161326af413619---segaro.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/sadejiradizafoxokogofuzo.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b2615d5b---mokikirejujomo.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/sigoj.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/tebineraretuvuwibesi.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/zibawiraniris.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/29351918805.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/71122140830.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-3/20210903044725237008.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/27598703869.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/99449008650.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210912_56A6FC71CAF4F485.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_off0000ae36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC648 15656 bytes
SHA-256: d71b3059c0269b39a400d03836dfd486c61fba8022cec82824023d39d8240692
font_02_sfnt_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 10968 bytes
SHA-256: aed4e822ca07630ec66bdc17cc4ff67fea1945d99e94c8564d48a2c514e3388b

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