Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9db08a065b992b…

MALICIOUS

PDF

96.6 KB Created: 2021-09-05 11:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd1c6b9c316149752ba8c53510435081 SHA-1: 6ab17a040f817c1c376ee6ff640cc498ae08611c SHA-256: ca9db08a065b992ba49a47bb966ac66a58abd198057c3185fa3be39ad8ca8b5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as a lure to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mp-hd.de/data/aktualnosci_imgs/file/degejadabavekejixaget.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098a27f71826---78009851363.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607184fbd80d0---favavizimemedovoxobopudis.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210722_9A448E391C26D9C7.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/juluxawapag.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/fff650f5e8d3c0ec08a4e9795901935f/23831421250.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d66bc2493b6e82db7685df4e0f3f2a75/78513392907.pdfIn PDF document text
    • https://anfauglir.com/images/file/79496475954.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf3e520cc---65624448369.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/roredivegut.pdfIn PDF document text
    • http://iccarrentals.com/files/file/jitoziranotawemug.pdfIn PDF document text
    • http://scantech3d.com/files/52133812100.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be7d6fc736c---61356968756.pdfIn PDF document text
    • http://palami.by/images/file/ruwijinitukitu.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/giwudigex.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/pafikunozeme.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/75283812045.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/69063d4141dc7a3e4c32620c821a49ac/kijuverekumovoja.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e0f499d5a---64280040910.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/91630848035.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0535b3894---95941328922.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/jizosadajot.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608567cb08b21---buworuberasadezavuteje.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31fd46e1fe---datejizozuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=manual+do+aluno+univesp+2019PDF 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_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 19572 bytes
SHA-256: c9f99aa251d794a518baf09ab6cd7c47a70d268f3b2a7776397f7ae919a5b65a
font_01_sfnt_off00014384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B9B 10808 bytes
SHA-256: 3afa6070d8c182129fcc6c9988d77dba6b18704afa249904810ee4244dd1c2d4