Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdff64ba75b9802…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 14:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 07043d29ead609a7a69ae086205675f6 SHA-1: fb4f088934559c9771a2c0dfd42d15062f5b22c4 SHA-256: 3cdff64ba75b9802d2febb64a4e47f0bc5dd218d079a657c4104764e66dcbfce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves directing users to these compromised sites, which likely serve as landing pages for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c8a8c851---baxojoramubunoregate.pdf In PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8cnj4kisil0tqj4n30ktc1hs0/rutup.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/vifamaxikibelo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/60789946d12547704b2da04fcc4f048c/38177075424.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/89054786586.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/u72e64hsior6k0l3s6n71h4bms/52723161951.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/3168537166.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c1a558822---tasajegewifojo.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050207503273499.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/divetigikaviwupurimu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a467f5ef69c---73349750670.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/27456098348.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ppnlkdckvmkohbsaba6c3ppcsb/boxefasogapeworarup.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/62961518863.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6e1d0cbdc1dfb5ddeb33583f91dc20ad/giwenewebodimakefejer.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/77d9fa44f9d5ed87a296c78f34b6b1c6/31905614181.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5e1f03e863b1f4ac02aa438332065ce7/kurukefata.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/suxagumadubimipemeb.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a681cad2ad0---latofapatelusisagixep.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608511246ad43---favedinobokemupopela.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be76aece347---kexeleposevekebozatinopeb.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/91672087903.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/9942677608.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/89225372079.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f36ee60c06---9295360479.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081d073ed2e3---xefomuponokeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+save+html+document+as+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_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 10936 bytes
SHA-256: 7a457d07435d2e7e93e8b70070c753572b523e1e9f52c3083de2407624853042
font_01_sfnt_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 16496 bytes
SHA-256: 9ece297ad951bd0301b16e55f69f9d7e48602d882932b5de89cea342953613b0
font_02_sfnt_off000132c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1