Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb5e22cbe18a89e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 11:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 93fffc66ffa3ca23317e7091cb8af4fd SHA-1: 71c07d07ddaa189c41965ff0ac04ab3bde02f0be SHA-256: 9fb5e22cbe18a89e97c42dcc241dc3617ff62f96ead7cc467c006c7615b47de7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous embedded URLs that point to various websites, many of which are hosted on domains associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://protok.pro/upload/files/88841408312.pdf In PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4form1l380foh3gm1jdji5ca8p/91930425109.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/73854739553.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/89567825797.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/zuxagiredukalugologa.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a495d29acf8---85721149560.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/41855974172.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/13ce989da3c16691832667be2028366f/wuwogibe.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/18924921389.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c516f152a02---78201382422.pdfIn PDF document text
    • http://moffatcountyhighschool65.com/clients/878592/File/pesob.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/31578052527.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bb96e9ca4---sitopobosidodumujemenipe.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160853a1f91279---11728521098.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd25a011a8a---95915976687.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/dafaranerodojazu.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/7228695483.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/fekimulexatofa.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161143c4a28f6e---4914136653.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b36e8a0d6---ronuja.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/87ibhqsdoft1lqpvr1hrr6iv2i/73044789041.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/45987367745.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f017c0bedc4dd9d3904411a01153d351/lubepukojirafekeg.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/bodadej.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/kakupinoged.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fundamental+rights+borrowed+from+which+countryPDF 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_off0000d48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 17148 bytes
SHA-256: a3b0c231b46ffc334046b548d649cb5b9be8b33979d2aeab2dccc4d16c4ad7f9
font_01_sfnt_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 11340 bytes
SHA-256: 2a86534b260467a70d0f9c30249febe00cbf0d79b448e45a90797bb43f59b22b
font_02_sfnt_off00011af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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