Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc42003562db4d1c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 08:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1fdd0f892abcf328f46532309b944f3b SHA-1: cbf4027d98dfd266c5984b09049822732ad16f3c SHA-256: cc42003562db4d1c3fc6d60d5f217f77a20d0bbc493772aaf433c6c388c78979
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, many of which host other PDFs. This suggests a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b0843df0df3163eeea468b04d7b0515c/60011375711.pdf In PDF document text
    • https://flyags.com/editorResources/file///zaviranapewirifonigale.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/dopom.pdfIn PDF document text
    • http://drtamerturan.com/file/42037486851.pdfIn PDF document text
    • http://digifast.cz/userfiles/91408875942.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608849196661b---6877679943.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d73ebccef---53620317560.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/68666911281.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab5b40b49f---53498893995.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/velodabubefujibufasa.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3c4347597---36958741500.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3a7092d8e---sekateruwezuzado.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/22594990584.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7g3bvmdvntu9ni9shssf4afja2/gulojuxisaxov.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/boxerawijowo.pdfIn PDF document text
    • https://andhimazhai.com/images/files/zipazetavilebexabekexa.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210617230107693.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/misijuxikorunaketelu.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202108281000335669.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/wamimumekajibowewuretuj.pdfIn PDF document text
    • https://comiconfezioni.it/file/78147744609.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///pipuxanez.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608553a35c657---42202321778.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/949e2ada3cc5622064f42dcbf1741736/kukageke.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/88718049410.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69fc631f41---81948714681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=goldstein+classical+mechanics+solution+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_off0000d3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BE 10924 bytes
SHA-256: 8f18c63c6c2487170a0ad40b35ce92284baca52c63c66308ef49e4f2aa535052
font_01_sfnt_off0000ecd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 17856 bytes
SHA-256: 9814deabd5b18b54b30869a5fcbf1d6df52a6f576c09084f32f582c945bbffc8
font_02_sfnt_off00011b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1