Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b78fa967343ae19…

MALICIOUS

PDF

96.3 KB Created: 2021-07-24 05:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9847abda21d0a2273fddd7a1b51d2bf4 SHA-1: 30d9ad784b372d15fe1d1e5ab0a7db2a286ca4e2 SHA-256: 8b78fa967343ae195600b3a87ca643dcd4ec78988b076b2924f516205744e5bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a69716de---54185051268.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a545463a9---lapopekexaxuvagebifegatin.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/60264358263.pdfIn PDF document text
    • https://kopari.hu/files/file/37799601757.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/fuvodilojaxop.pdfIn PDF document text
    • https://ijp2.com/contents//files/fodelikefadabuvunitu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0453e163bfe462e68cf70898b759cc94/90294946122.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/suguvuk.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/23634fe58d57539423bfc811a5e9ded7/51877081133.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/7327370587.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962fa2866c0---90516098761.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/30622850663.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/bemuvura.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c66203cb202---texovisikujakesusix.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160784f819e94f---84645070627.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/54632953116.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/fudixebofeli.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6b1ca0a7086fdf397c3097d3de3d0081/leginejavifebijij.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/ffa4cbd612f57a3643e4dd353bddd777/1423890142.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6464db6a5fb5caf83443b83c407dace/87995361345.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a349f074a6c---16859607603.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608502d65c0b8---fuvaleriwadowoda.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7ecfd2d54aa2f760bc8917fef394b384/zogodojulo.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/taridajipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=does+anki+work+on+chromebookPDF 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_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 18064 bytes
SHA-256: d5f62bc98fe47b96e8bd38659a8c3d15b9a958232d12e3202dcc4a282ab900d1
font_01_sfnt_off00012cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF4 16236 bytes
SHA-256: 9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40
font_02_sfnt_off0001428e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA5 10672 bytes
SHA-256: 6904d48e43d2a68958e7b35d7fe1e4672a8cda479cd718f3f5c7a3a4aef0bf15

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