Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7be93c11a79e8b…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 06:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ff2b2a0f2f1487ea28b84152809277f SHA-1: 1408e05f9c413ab74d9ae37a7dc2f49d105cd7fa SHA-256: ab7be93c11a79e8bcb22a4afff96b1c280f75cb4250f9110dd5b9bdf7f912407
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to lure users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/62d51350909cc20f26f00fa4c93ba5f6/vejamesobupe.pdf
    • https://cbdc.co/uploads/ckfinder/userfiles/files/vuwusoxepes.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d34eaeafa51---tizef.pdf
    • http://harekatmemuru.com/images/Media/files/vuxovodepuwetosuxijazig.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f2837f099---96910618864.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62f773b09b---55802135117.pdf
    • http://arch-teh.com/pic/userfile/54162113031.pdf
    • http://ehs1958.org/clients/73155/File/64384353304.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160cefc5c975a5---26442626483.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09dc4cbec4---memeg.pdf
    • https://systematix.pl/userfiles/file/joxuranevaxopir.pdf
    • https://aawyx.com/sites/default/imageuser/file/36784876371.pdf
    • http://asbufestival.com/uploads/FCK_files/file/lapebobakezedi.pdf
    • http://geniuschulatutor.com/userfiles/files/99161769404.pdf
    • http://czdashan.cn/uploadfile/file/2021050805505373499.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/67242786122.pdf
    • http://firegallery.ru/img/upload/4026116717.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607573d77adba---25509076683.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4df7e2ff8---52787642803.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/70727516287.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c29e589ed---6874013721.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608558b93338b---wapegijezemepu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+colour+goes+with+purple+and+grey
    • 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_off0000ebb1.bin
dd42873ea2c64a0728b7980543327711ede2f83a73a7417d820cf01d9c334f70
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 17616 bytes
font_01_sfnt_off0001183f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1183F 16792 bytes
font_02_sfnt_off00013056.bin
152b1d4eb5e99e82828f156cf67c60185175a6bde9b4a7ea5c66aea3dc29f379
pdf-font-stream PDF embedded font (sfnt) at offset 0x13056 11088 bytes