Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac57876ef71b5f0…

MALICIOUS

PDF

94.9 KB Created: 2021-08-17 12:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 982bd560a0a5acc738d71f89f8d8b6e8 SHA-1: 1d652869e9f06890510b841255a9326097863f99 SHA-256: 9ac57876ef71b5f0039dfb8c8aab23259525ed2298df7c8d28eb9cff9d1f67d3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised WordPress installations. The primary purpose seems to be directing users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/35560eeb265c9b0a3b50767790ad8625/toxafef.pdf In PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/62057891858.pdfIn PDF document text
    • https://makenie.com/upload/files/21771601369.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/80679745689.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/24459369795.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/57359047925.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea8c09988---43600224246.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/dfc5c67bafe791b0771ec3276a13429d/39566908513.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160862d0b4c5c4---81615733809.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/jutasonad.pdfIn PDF document text
    • http://labsshop.com/d/files/gijumixaredu.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/ramesuseditujamu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc926e30648---9207080671.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/gusivugixebogapibekavanu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5dd19bab667acd97c8399940de7d2ba3/javivovi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7092d346d---nifosetewugetosepo.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/lipixuvaloburubifafu.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/rifuxedokuvejizefubimedo.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c433e13f4---39410990763.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/002993e28d3ff8ac4bc9a89d17dd9580/jurerol.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4d6c32527f19266b1b6d6bfb518b7f06/57249525130.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/241901015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=planejamento+anual+4+ano+de+acordo+com+a+bncc+2020+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_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 18644 bytes
SHA-256: 660d0ba313b0d4c8a3b37b4cc04c932ca449e4d749a296b6255586919825e8ff
font_01_sfnt_off000138bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BD 11212 bytes
SHA-256: 0790245f74a85688cb86332068a371f369519e8c8b05e416be67a7340ce982b4
font_02_sfnt_off000152d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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