Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65974fa7f684b9c…

MALICIOUS

PDF

71.8 KB Created: 2021-09-10 09:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3456be4b02d06f70a21b41fddff5f6f5 SHA-1: 6311b13e751af526c175d1f7ca2a3e4b0fa75493 SHA-256: d65974fa7f684b9cd47dda7308192ffd4f875a0e7ff15c96a020c78e6502f5bf
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=ghd+sports+old+version+apk PDF link annotation
    • http://centroolosprato.it/userfiles/files/86155715048.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/7255150737.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090716362973499.pdfIn PDF document text
    • https://khanikango.in/file/69484165847.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/sesililopiwazebe.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/57098301078.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/menudejevokuvelavido.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/gusevopadagesegeviwogi.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef1b800cb5---49548003071.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/wixizavexi.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161389486e5312---sefozukezigukog.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/depigewimujigapikapuboler.pdfIn PDF document text
    • http://skupka54.ru/upload/m/viwasa.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/1095085235.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210909_07E34F311D164DDB.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/wutebupawufula.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/fevujosav.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/gunibiposefobit.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vs4ev9f11jd2cldl0ksjp8t1g2/55463732306.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161331142cf69d---22767774716.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/ropojo.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/58478090589.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/20335282692.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/60084251839.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_off0000b8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EE 15936 bytes
SHA-256: 6821efc2ad3c38e1436243e22b9cf698cca2cc30006ccb084b242452d9131378
font_02_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 10684 bytes
SHA-256: 2f897bdf96467cec841c545c47c8c8ad3e95c39e4b95830ba75e02b471eb7a55

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