Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bb6fac5a8ae5c0…

MALICIOUS

PDF

72.8 KB Created: 2021-08-30 18:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1dac54d53e988e3c7937d07554c2a1c0 SHA-1: cd17a33a57e7532306b20f942e438c24164be478 SHA-256: c1bb6fac5a8ae5c00649bfb9602a8756a0b7a7feb65bde4cc9457e6910b9555b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised websites. These sites likely host further malicious content or phishing pages, aiming to trick users into downloading additional malware or divulging sensitive information. The presence of multiple links on disposable hosting and compromised CMS upload storage suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kanstm.com/ckupload/files/punenobenofewelaxeraw.pdf In PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5f4584d31---84872963801.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a81934bb1cb14be04c4883b4fe8e542f/39608443236.pdfIn PDF document text
    • http://snsi.jp/image/news_file/89278423296.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b67ab86f1---93239720932.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba2a64191---98454700804.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160860e565a924---1376020793.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/33870868665.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/gr2je786sb6cs00t7b123uvbab/45800852714.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210724132556_bj5ggb.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bae1d215af---21747872584.pdfIn PDF document text
    • https://highrise.pl/file/virojabozu.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/jetajoparirematevagojav.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/44251367864.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5a1e4a1fc---gufujakaburiwur.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/54517925737.pdfIn PDF document text
    • http://juentai.com/userfiles/files/kefiniworadimiruwu.pdfIn PDF document text
    • http://europacreativaeuskadi.eu/files/galeria/files/tawumatipirekizom.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/xupik.pdfIn PDF document text
    • https://kermanrooz.com/img/files/79667723343.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b624337b37---dumudaro.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed2e8744e2---leteruxotonawoziram.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/vanarutifadi.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/9eed7cb8b2c4cd4b5206b15801f2b364/27588071347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=my+husband+my+lecturerPDF 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_off0000b98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A1 10768 bytes
SHA-256: 8a12f11f551cc35b89199b8102ede1162f2d262c0847a7fe6e87c589b6c8ede1
font_02_sfnt_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 16828 bytes
SHA-256: 7d5216cefa59e59254fd4a992d608f9c673376d8262951a2e085662780a721a5

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