Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ef43892617b4c8…

MALICIOUS

PDF

96.0 KB Created: 2021-06-29 23:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 9fcc106d924654f46d62885243da84a4 SHA-1: 2799a35807aeb284d26d4b68c9ac26d36d8cb144 SHA-256: 66ef43892617b4c882179efe02cb89ef8a214591e75ae799ca8898741d2362cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to compromised WordPress sites and other disposable hosting, suggesting it is designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 https://drafthe.ru/uplcv?utm_term=old+friends+kenny+rogers+and+dolly+parton PDF link annotation
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ebbb8c911---jofejidezimirezof.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/l8aeq13igt5dbsefoe8nqdo7kr/vabewiwut.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f7d9b2b628624ac5d277784b676f15cc/wuxevisox.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/693c2dce66bd6fa343fcf800a96cbf4d/83968908977.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/mowufaxuxakuvedetoni.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e44df7a819---mokaded.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/n8kskefa1uivupvcstaph3tt8n/fivurevotazavixupugupoz.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/tiposijawegifuvamagikat.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/60052508482.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/38528317542.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb58c42402---zajowaviv.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/48577630575.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16083975ded5e8---budutanarub.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a396d5b0---nudezetiwuzomifenetodonu.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/19cffe2bc5f4fc8b5316d4e9d29cacf5/xamore.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e85ce80f1efb4b4d0038312b65eb549d/65665376255.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/2790654818.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/1e360d2d67ffd220b09b2395b062f30e/walotaba.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/amrd2lnbnfdm7fv46sg7curh8i/vipugevoxerefaf.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/baf22a0e65f511da8bdea96246292b64/32250460792.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607071a32b84a---26319469647.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6996f228977dbba00985b13c0266b7c/tiviwajovasodivodutavewod.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/79362724876.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9613c1c975036eb1e0affaa2c6d5b1f2/64516486897.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 17632 bytes
SHA-256: 20bf232742b391fc2213a1e9fe74f8f4ebf2c40c9cec9bf0c8ad5d370fc60e99
font_02_sfnt_off00013f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F46 17400 bytes
SHA-256: 780017138479f55a3882bd0583f2519ec6a0c014fcb88acb773604e03445b24b
font_03_sfnt_off000158d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D3 10904 bytes
SHA-256: 7eb382aea913b81e3c169c7001d83c971206dffa271a9b8455b3aa244dec6e60

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