Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d6e525d8f4a936…

MALICIOUS

PDF

83.6 KB Created: 2021-07-01 20:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f54254c79ae573fd50f6a53d2cb3b519 SHA-1: 07be23deec8aec14fafa6369c81bee5c5713794f SHA-256: f5d6e525d8f4a93689649fb65a28b7df038b5b2990985921997e1da51a7acbf0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://flywings.sk/UserFiles/file/77187075241.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/pinufufoperugor.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b83375f2ce7---44366226877.pdf
    • http://zcapitalcrm.com/app/webroot/uploads/files/23912210776.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51f7db4d4---55212019063.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/12ff9781764c4f1b8213ab9de1b1cad6/35201055709.pdf
    • http://roocenter.ru/upload/file/buzopem.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/5pepgdcpnmidr80n3grgcds614/remiworaru.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/df8570d1bee8c61cd6a76ef9e7c7ce0d/16196806038.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/11052b76a3295af86c7f84897f2e0b19/wabavogofo.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bbea3680bbb---31215486594.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5edc127cc8---suvuduz.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864b9936be3---vuriwusik.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/kn6c2n3nv7cbme284bvket6gl2/dulakazabakibu.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/782560702e4be377d72404b566dfc785/54804689152.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/41119820046.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e583aba4---47447984225.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a3e58a45---22271343121.pdf
    • https://narimasu-chintai.net/jcfiles/file/95376781020.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743dcb63d30---bodifomipelineziromitu.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8a74dfe935c5dfe221551fd2957f680d/debutakabarevixadava.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a1876c7012727d21d0f4df49ad7f424a/72900670590.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=perfect+roasted+chestnuts
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e47b.bin
678e491c515824dfdee3683b237bbaaa6ffc6051b8331c2361a464b77334e5d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 17360 bytes
font_01_sfnt_off0001114a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1114A 16792 bytes
font_02_sfnt_off00012961.bin
34eb305cb6ecf5df1213c6c2f3bb43cad8e822cb2b64a0d8f59c4cb0ecbaddb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 10536 bytes