Malicious PDF — malware analysis report

Static analysis result for SHA-256 6100986c87bd39dc…

MALICIOUS

PDF

105.5 KB Created: 2021-08-11 17:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fef8ee3e252f4825e4584048f1142703 SHA-1: fa1c2c5102124bf839cc72dad6bfaac272931df9 SHA-256: 6100986c87bd39dc87a7cb6a050f926d43b8c65f1ad0880f834cb50546f2cc62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF identified by ML classifiers and ClamAV. It functions as a link farm, directing users to numerous URLs, many of which are hosted on compromised or disposable domains. These links are likely intended to lead victims to phishing sites or further malicious content. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9056

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://huntic.ru/uplcv?utm_term=decolonizing+the+african+mind+pdf PDF link annotation
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f7d884d44dbd721eb681c0b298fcd632/10971040383.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/fumokopogogipudepud.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/55597479437.pdfIn PDF document text
    • http://henca.com/files/details/file/jebok.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/bixomedexek.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e91a5d69c---6222181251.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cc6h8ftvfg6fl8mq4ka6cmn687/riwefifukutefegifepixup.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/77395556022.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a1ec8fae5---284473220.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddc248e710---sovif.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32c8444b46---7000532056.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/71915407916.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/76998541674.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070af8d67812---rotata.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/393oiu8l53a3i4li59hc6iraja/12987303567.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/91034129227.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/denefetobipeve.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/xunatiganexafekaxip.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160869c59acfa3---99158587102.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/vupojo.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28529538310.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8d7ef36d1---jutevesiz.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/erp9r28entjmdu5uj24a5fjslc/35910303282.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b25d2da28b7---mofuxosik.pdfIn 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_off00014568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14568 17708 bytes
SHA-256: 19de671c414e2ac2f28cfe54572994c4b77fba7eb333a6ef948897dc89527e93
font_01_sfnt_off0001730d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1730D 10960 bytes
SHA-256: a209a61ddf30468a7730a2af89370cc1f626729688b98ff125236b121f8be1e9
font_02_sfnt_off00018c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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