Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd61eda31f4d03d…

MALICIOUS

PDF

90.6 KB Created: 2021-08-09 19:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c3ea3ff1bcf5ce029b00538081aa35f SHA-1: 800f82cf2d0ff52971f3c2c51efd62266eeb908c SHA-256: efd61eda31f4d03d5abfb62666ef1346f5e1d54cbd487f656a1b813a1ad852d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it's designed as a link farm to distribute malicious content or phish users. The PDF's structure and numerous external links align with techniques used to obscure malicious intent and redirect victims to attacker-controlled sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=ejercicios+proporcionalidad+repartos+y+porcentajes+2+eso+pdf PDF link annotation
    • http://393citizen.com/upload/files/71568202461.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/xupukijosevexeje.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/13465605015.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/62114671651.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/3771620784.pdfIn PDF document text
    • https://mackbeks.com/files/file/tesalazemilol.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b84861df88a---jatupobo.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/15833656883.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160849406ec2b1---pupesiren.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/0abdda9d3689c9f6f0b962472cd001f6/nadubirufe.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/47076411433.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e45f8ddb627---jijisuwatofigekomabub.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160802adc19b81---97845613890.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/wulokubuj.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/5370e4ae5cfb57d9c8175e8814c6fda9/widugumiluvujekosoxo.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/kumito.pdfIn PDF document text
    • http://labsshop.com/d/files/20925130252.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/38f7e8c4762069a0132cee25adf6bb7d/79120169728.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/gawunorowo.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e65d71522e263850384fe6480c1c3cc1/luletinonubaxurexifizosu.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tatabakajironozupapusil.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160814c6a08f8b---pajazaluwegozi.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16108c9ab3605c---40148759064.pdfIn PDF document text
    • 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_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 18516 bytes
SHA-256: 6520bdb4b4d805e24b9ae0b4a2d24d8a3b5bc435f3811d5720f46d870571f3da
font_01_sfnt_off000127e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14000 10960 bytes
SHA-256: 6ecd0167ff6996720c6b5b03fffd5a02672840312461c7da981b843aff2875e7

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