Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b89d0c5a82254b…

MALICIOUS

PDF

87.2 KB Created: 2021-09-02 06:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb13d6a4acac2b2b834040ad2b30c5d2 SHA-1: 40e63b226ac9dcfb63d1ad4cebc5fd33ea5ebf7f SHA-256: 17b89d0c5a82254bc7e1a598848864bc7566c6ca38cea370178cca5f74f9edac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, with many distinct hosts and URLs. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1bc828771be5f733c57b61dba8501080/18076817607.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/k7bfvakgsci9l4jl2n68s62ed7/nawekebasegep.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bf17028f74f---22067210674.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a165560fa---tunipag.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a453b151664---gufekoganogojinakovaxo.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/zopuvufuzisub.pdfIn PDF document text
    • http://modero.vn/upload/files/15891104795.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/5febf0dc6b85fcf99073ef114081cc16/39731447027.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/vudebeferolusakune.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/livagakuposivug.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9bf9f5110971227d4621fcd85abfb82e/748350611.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/3fndkn1svdihrsnp9o4b0h6vvj/17356402229.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/tofovovat.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/6109qbn0pusobodncd281dr81f/38224228291.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/xatizigiguto.pdfIn PDF document text
    • http://becucci.it/userfiles/files/41467774326.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/86527996926.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8941bddd0---rebipepinaligipadubasevox.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/remumunabifijasijix.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3580276d1d---lamorufilugizilupapopebo.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/fukewosubi.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cffaf26a9ec---2228624141.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/87922064816.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/motiderej.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/26170868260.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f8605db20---11643176328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=atomic+no+of+fluoridePDF 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_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 18396 bytes
SHA-256: 78e0e6699473e781934260e419a82bc4fea6aa9cb8a255ec58b6fa5eb520925e
font_02_sfnt_off000134f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F1 10388 bytes
SHA-256: ca7ffa0ff56c5c7fec8861699396a6803418cdde4ef2d6d818b2693e827d07b0

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