Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ff1a84b5c95f3b…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 05:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eccd2fade3b54fa7f334a94ef925d876 SHA-1: 78a48fd86a416a348a74810973f1efd987f4e716 SHA-256: 85ff1a84b5c95f3b4a364d8fe012c99f53768a68e69ce835beab304e97c1aeb7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=libro+aceites+esenciales+doterra+pdf PDF link annotation
    • http://animalscipublisher.com/files/upfiles/file/33240642892.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/tosudiwatixibowoxexe.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/80996277334.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/trl0dojup8evon8i3j3hcpisj2/wodipifuganovepuledik.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/takegavolademamelumax.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/gutifunirebufigimisuvoni.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/bisafamepizaxanixefivod.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/4878460672.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/lumiwinadev.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cfd85550d---kufetuzutusutaxuguvesugif.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/45190059004.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a41ceb567e8---lubulegunidikozi.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/47003333591.pdfIn PDF document text
    • http://strihaci.cz/userfiles/file/pesaloj.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfcdd16df---32121129664.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/fewowapevekogavexelude.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/57022587060.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/wikemamiladaxob.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/pofotiradazo.pdfIn PDF document text
    • https://gilbertems.com/videos/file/fanigotirefinubumonini.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15e3f3d750---89547418668.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/903b70bb392d913b02cd86be465b4fa9/tozidozisimavax.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/rolanumatizasuxixunukax.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/970834866.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_off0000c47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC91 18964 bytes
SHA-256: 79eda1800fc52910e324331e65373d4c98c9238408303a26822021ac39723c4d
font_02_sfnt_off00010cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 10708 bytes
SHA-256: 9093f6d0fe19608666b7cb0242d37aac0729333f52194730e737f49cdfa72395

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