Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb042f7d4ad6cad0…

MALICIOUS

PDF

96.7 KB Created: 2021-07-17 04:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d74f37662561d0f38678e39b81c3d95e SHA-1: acf0b259d4969996cc2c86787311053be8f49681 SHA-256: bb042f7d4ad6cad0044fd89de862e76e073de9848f5ee13c0922fca10845b352
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://notarbrazda.cz/userfiles/file/68943634125.pdf In PDF document text
    • https://birsamundapark.in/userfiles/files/43867896631.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3b671a6a---18152007236.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/botipiwifeg.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/e89da9630b455efc067256051683fa6f/1327337762.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec11b9a3f---54116491993.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03b47029f4---77646314961.pdfIn PDF document text
    • http://amdind.com/userfiles/file/nizagapuvepijaz.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/34493302043.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/jovaxaf.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2741caef75---42058841106.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/gedidakeduvadajasateju.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078fe4ea8ae4---16402867936.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160bf404b3f874---8560952620.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/12084482404.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/58901324527.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/gudejefabafavewut.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/83774615393.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160920e1d6f2c7---lufaxuziwidebuveki.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b095f946c58---90673778509.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a847b1060e8---goxokefirikerujemowix.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/de4de890e1cb52242a9f4b29f907a758/47520058482.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/9837c6f8c7ad11565938ceaef49d692a/vubovoralopikapaf.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/tanujezewerefupavomef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=weather+unhealthy+air+qualityPDF 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_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 10272 bytes
SHA-256: 67baca6b48404f75022f6ffe13e3b0fd4bf7733ba6bb25244528bcef09a2444e
font_01_sfnt_off00013126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14938 17088 bytes
SHA-256: 8bf50464126e2e70609c8349b516bcd1fbe80eb33072bb2b272995b2bd44c92a

Open this report in the interactive analyzer, or submit your own file for analysis.