Malicious PDF — malware analysis report

Static analysis result for SHA-256 237f2bf5221f23bf…

MALICIOUS

PDF

89.3 KB Created: 2021-06-26 04:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: be3b8a4806518503ffb6493a4e9c0ac6 SHA-1: e0aa5dc18c53f7ccdfa930d1970ae6bf1942865a SHA-256: 237f2bf5221f23bf8a8fcb2214bed02324093fa4f97f34d87db1a1ea96dce460
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites hosting other PDF files. These linked PDFs are likely part of a phishing campaign or a malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609299877edee---purejawewakosikutelos.pdf In PDF document text
    • http://ingpoggi.eu/userfiles/files/raxejewigonukokipoj.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af959e8c0fe---zubopuwutukefixulako.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/23728866377.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/zejavagaranijopifewefu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/9enc2sps13rrl1r1tef5kudmtl/54168122632.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/af53a4ff968bd36dd44cfc0a86a061f5/60316340698.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b4f715baa---bepisipi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/73871cbca0506840659fa998e2ede320/gaxinotuseregadux.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/68263888162.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/470f17199482bcc8732954674cf5e932/jitod.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085581ba8a2d---madilirolemetomawemafoke.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/gitoforoposifujuta.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/582db8fac97137e5547558b73cc84332/26364958154.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d66cfce932d---lexine.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/lifilogapupusukuzife.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/18623536256.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/14396553259.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/megutarobufuregodepiregob.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/kurawemafagopozifisox.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ac1b21428---bofap.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/tataxoma.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/fut9h3sq7eqh6ifglpohqe65e3/11398773194.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a9f174709---60181433609.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8ada1113f---38218136705.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/zafif.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ld1u3h7e3l04nu2e062v5hs9t7/borupazegadejesuvol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=chinatown+point+steamboatPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 10628 bytes
SHA-256: e0162af9844c35577f17297d6e727dfa4c64acaf9147faa01ad00d6d5fd14c48
font_01_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 3916 bytes
SHA-256: 89ab42d6ce79fafad33bc40463c9f6108acac337ebc2b1cd901bd967deb915a6
font_02_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 17824 bytes
SHA-256: fbc813604cca1c0af95f55d3868a2eba4d1aeec85b3c6cf70ab0548a72ec29db
font_03_sfnt_off00013db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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