Malicious PDF — malware analysis report

Static analysis result for SHA-256 436363a0ef0ac2fa…

MALICIOUS

PDF

88.4 KB Created: 2021-08-20 03:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59a5103ad101c8e1580b03b3cebed371 SHA-1: 126a5dd53b6649ffa1661eeadf21d4a03fb8b95f SHA-256: 436363a0ef0ac2fa9f10eb3d366edf53d39abfa8ebc304c53c8e578cb428174a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm or redirection mechanism to phishing or malware distribution sites. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/uplcv?utm_term=how+to+calculate+superheat+and+subcooling+pdf PDF link annotation
    • https://gitedu.in/ckfinder/userfiles/files/jasodov.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/9d6fb1ad85fc421808741bbba314a383/13826782198.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5aef674ce7dd68e795d00af1b2b4ac2a/filujafaratovasijas.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823668915ec---81887103349.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79f6c77c4---25874557161.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/60096460236.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3e527c2a---mosufero.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/fme9j3tks3ckd6a1b6tsr7a766/gadakisaxinusuzosupe.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc34c815eb---wotaginaxufekipupowinewot.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/da0a5196806154c11a53c89ac8d99782/kitonakipojabeluvode.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/52696006317.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084061b571ad---visewatun.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d74b4d79fbb---mogulotudesuseda.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4822d8e542---69923258252.pdfIn PDF document text
    • http://avgdesign.com/userfiles/file/karokodadoruzalapex.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/sopad.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/tipogurilusaremuf.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6bd87d1fc67357ff0180421c41b1cca3/vopagovuvome.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/gagowaripojebatuvodarevuv.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/tasigotiw.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2c674afc---doxazewogirak.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/23225089938.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_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 11216 bytes
SHA-256: d8a463041ef1349221e46e699ae84f63825e22707ceb4bc3889753297a0a6dc3
font_01_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 17480 bytes
SHA-256: b792b1fca4b434cb28b9429d7fb1b4effa1793cb7a5cdf4743fd407908e67bd3
font_02_sfnt_off00013ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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