Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3dfd96a03b4be57…

MALICIOUS

PDF

123.7 KB Created: 2021-06-30 19:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1bbc976fdec144d1fbe4ac62f79b9e0d SHA-1: 3e326b1505f261bcef79eae7de0479577d6d5d4c SHA-256: f3dfd96a03b4be5794f202cfd842b5167e1f0621052dfce0d0a8ad7e820cbcf0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://coimbra.hu/uploads/ckfinder/userfiles/files/81047334641.pdf In PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/sowepepudojolozeli.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/supaxobunoxokaxaboli.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ki9eur6bvmh1s0gv33gvjq2g35/80907303988.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/8vomplcj1vap370r37paial2oi/88745873520.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/56623095393.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9b987365a3d94d7abc705f4a4aae3978/konib.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/12250980393.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/jopeginebesemizawo.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/55083549766.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/oislsvpkpaplkvbgcair2m9i83/50545827290.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/27463706345.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab43d5469e---rudim.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c03b46bb---48643274392.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ee5921836---kobejotinedeweveropuve.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98d4501383---masopef.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/pvib5tau24ibd257r3c4i0edn6/xuxoxurujovojotilojoz.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f97c6e02---25418167651.pdfIn PDF document text
    • http://pronobile.de/catalog/file/59861528256.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/zunebekaseribevosi.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/11187757256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=japanese+phrases+to+know+for+travelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F16 17900 bytes
SHA-256: 77f501ba588fa950fe47cb4b7c046fe6f48ab7a6beebc15c8af5c8b889b7aec2
font_01_sfnt_off00017d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D39 17168 bytes
SHA-256: 73063a10810fc9daf3b91ef935ec926bdc75c4cf1c46b709fd04dc00e5683907
font_02_sfnt_off0001b0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001c8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8D9 10596 bytes
SHA-256: df5a7002d9e87815fd4555e75884099b54371dd23cdba1c3f668edf0a27752e7

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