Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc79999757b6ed7f…

MALICIOUS

PDF

84.5 KB Created: 2021-08-15 01:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c06eb3d1c30f31f82b2b5381739c20c0 SHA-1: 889d24939e8c6938958a56a990607b30277b234f SHA-256: bc79999757b6ed7fd2a38b5fec4fe33b45aafb95f1b7bee48214320c70e611bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are either compromised or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://journeywithmypet.com/ckfinder/userfiles/files/zuxewabopezesiv.pdf In PDF document text
    • https://aonetreks.com/uploads/file/mirotiwapilalufi.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/79942373860.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608243bcb7f3f---33868324655.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/26332148828.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/50240043418.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/kowitugojexosebam.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/44263947098.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/5aefb307df1475a026f4aeb57310bb0f/bibusadofiludesumegazisaj.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/eheov7ae1bd76m8opsvlrvu3da/gafuvodonoruvazepunizi.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/gomaletuxak.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/81445015142.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/towimewikibefo.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/11840735624.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/22256358595.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/23004967704.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/solitufifebutuwa.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/silafovetulazewewida.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/72272855121.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/66892296448.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/b1tithnorforfij5pkt4rjsj86/76661802228.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/woduxopakowuketibaba.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/jofipuz.pdfIn PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/81326076650.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/8b03b66956a5274ce15d1ef29d91d28d/77542479453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=jim+stoppani+arm+workout+pdfPDF 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_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 16520 bytes
SHA-256: 43b31f88477cf3fad88518fb9941e613e53d0582c41943d3c677fe005a7f46ca
font_01_sfnt_off00011081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12898 10748 bytes
SHA-256: 4076286e9b465f905fef549f3b24e9053b42d7afae6d899604f50168c93e0fa2

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