Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8e98c909dc8dc2…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 00:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 743ef94d89dfae07859e13ad0b713749 SHA-1: 2678fee0fff0fe1856fa2f69b1bab91c391b06da SHA-256: 5c8e98c909dc8dc24e7580ed8be9c6fa8a02196eb88b8d6b0d146d681b0a5041
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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 https://oniceh.ru/uplcv?utm_term=where+to+download+tv+shows+for+free PDF link annotation
    • http://lso-msm.com/userfiles/file/33620090485.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/84443457757.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///bamagemoru.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/48563516660.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6cab079cb---viratifuxumaxi.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/17142440350.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/runanodimagosoxaja.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/wibusesurokiparunu.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/25650219669.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d63fdb833---kidekokunu.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/12819557300.pdfIn PDF document text
    • http://builderall.info/userfiles/file/85139173597.pdfIn PDF document text
    • http://cissi.it/userfiles/files/94008364452.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/banopugi.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/bikutowinurofobigu.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/78825573584.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/49223208640.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210910053542.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/nozowakosumoxanizef.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135623a6c8a4---fuwufivuzuzizalovujejud.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390e64092e9---panumuwonefitaju.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/57666691668.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/solasaxege.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/60290691409.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/57231506797.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_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 10504 bytes
SHA-256: d80b1fc8cf767e58efa4e19872438e68066864618ea6d9360d56baf95cc38883
font_01_sfnt_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 18708 bytes
SHA-256: 292848494f5e27744c7acd8b62d57bac06167903a2da784952c233ac4eddcc08

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