Malicious PDF — malware analysis report

Static analysis result for SHA-256 b210e3e1504801b0…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 08:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de9a8cad2a9de0a606df98f762c992fb SHA-1: f63f17c88d5830d2fee70ea53a05289d8f541293 SHA-256: b210e3e1504801b016a8188965b3806f7adc221eb0d788a97698e3aa4a13fe1e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://ajwatravel.com/wheelmarine/userfiles/file/buxaxevetesewilekuburofo.pdf In PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/93a8408edaa112098ab74a81fe99832b/porezesag.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/63575631530.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071da3a94810---fomupixozikatumibep.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/49314604954.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/vpp8a3q0v98i9bgi42pi0g2dlk/wafisisixajetoravej.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/vogufavalunobabifalijumi.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/zadonubimidebefowi.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/47105747057.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/vikowufubafoxalivofumurev.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83969036894.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607198978d004---wirebu.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/11840315371.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/gokowumunabigosater.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/lefijot.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/99uqcjm4c5fn8862l70pai7dqh/fotijezopodi.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/teroziso.pdfIn PDF document text
    • http://cpils.com/userfiles/file/xibaxikad.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210820115342.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/6582821536.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7m8flmorjdtlfbfl8sta85dk71/xureto.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/51975548954.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/81737963579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+compress+adobe+pdf+filesPDF 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_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 10896 bytes
SHA-256: 5f5a4c0847e1a0427fc18132b78f4be17c88196ff6ae6e62c728fcf84cf62015
font_01_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 17060 bytes
SHA-256: 65c9aa5bb10163e4c9199ff43a7855ec5d924e33feae7eadf4e77eb18103c602

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