Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca4e73d565b7463…

MALICIOUS

PDF

89.1 KB Created: 2021-09-08 11:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4629574edbec6672d0a935575f68e9c9 SHA-1: 637e887b014d8c5c012e7418bd9a39c7b211a188 SHA-256: cca4e73d565b7463dd70f4de1f3a29afd7332200d4f2c6a51b80d471210f3574
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URI patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081cc0cc3720---jetowedegob.pdf In PDF document text
    • https://avenue102.com/uploads/file/98253310468.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/f0r004va5qd906id984nj7pd34/patazi.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/sodumagavajaka.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/16815528217.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5be00e4cc96f0401ee1b9f26513a2214/5259934853.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/3444021917.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e2ad2772bce15fb243afc8f9753e5fe0/11015301266.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6a90eebcbb5f4c4d881171aa9ec64967/76323769637.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/9f9043fef06783cbb4896ad7ebf910e7/wuwefilixefofonire.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/fefekupose.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e030c0f2375---gopemelozalon.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/murudoditesamikiparu.pdfPDF link annotation
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608622fff1726---35692459826.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ceee6da33---64060632649.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c91a4075957cd6027e1afeb64ac0c2ef/32709655283.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/7918896510.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/53906175753.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/85747706359.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f77469ecaef---48790101378.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/kakigit.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/75707752081.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/98998206154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=n+d+bhatt+drawing+book+pdfPDF link annotation
    • 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_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 10724 bytes
SHA-256: 413804c787a30b2d3e5322aff3a43b970dd64faf2acd7158b7019ee744704947
font_01_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 19952 bytes
SHA-256: ec990a21a25fb7d0f59156782c1777e3b4a1074b3ff2246d6e32c2f723d58f7c
font_02_sfnt_off00013e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1