Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0c4e89fcebf29b…

MALICIOUS

PDF

93.2 KB Created: 2021-08-02 11:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b732f07bcdc77345d774454b1f4e7f82 SHA-1: 7c15bcc00c45008d059d8b66e867197540ed0b62 SHA-256: 0c0c4e89fcebf29b33209b5603e1c08b2a683d3f3780a7fcb0ca41bae4c9aeb9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://al-bandak.com/userfiles/file/rejitado.pdf In PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/vasukivefekufegufarad.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/42699019373.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/cpabrc69vpnm0ndg5r7ned0jl0/11368878190.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/gemorikafadobe.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/80447876178.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/4262136509.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/8a84dbf79150b53a3e4283aa841da630/56275784834.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/3466584457.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/tasogerigor.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f068470c2---6045706406.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607418b92f9cc---gevunamulatuxukopexelizi.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/26574818468.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/sajowodorawufoxebafubines.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160877dad8e01f---vuborazejerov.pdfIn PDF document text
    • http://fructusartis.com/i/File/fivipeji.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d3202201915f8f55f35ef5e1d7888e39/dubir.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c432f168465---89101936868.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae03723daad---53982677259.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/7p6gkn7hghru5difi9gampe59c/tekofafuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=subway+surfers+game+free+download+for+pc+windows+8+softonicPDF 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_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 11684 bytes
SHA-256: 6c0dfb43586b4a11c6722309e4650d2633f1a79c025b8b3045f20d72a6c47b40
font_01_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 17624 bytes
SHA-256: ce661bb621310fc9e7e4e5f9d90241f8dd78896a216bdcb02411ead409554c54
font_02_sfnt_off00014e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1