Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22423b3b73d23c2…

MALICIOUS

PDF

69.1 KB Created: 2021-09-12 14:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26362b93f6ddcc58a9bcee517a590d8c SHA-1: 9fbe8f51ae97a3468032f8ee74589247558ec2c2 SHA-256: d22423b3b73d23c2bb38eaabd3ffe30dbd95ac7b597c82c61d214755e0c0331d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users. The heuristics suggest it functions as a link farm, utilizing compromised WordPress uploads and disposable hosting to obscure the ultimate destination. The ML classifier and ClamAV detection strongly support its classification as malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://groupekheidri.com/ckfinder/userfiles/files/39335375950.pdf In PDF document text
    • http://volker-issmer.de/userfiles/file/gemasotuboboti.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/fovigi.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/2080024104.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/55405315659.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/33834378764.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4341a1553---kadaditexugarupa.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/cmm2nk3oqdls79abb152bqoo0m/42924030105.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/52831100698.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/zigulagobir.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/11400029385.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/7323742655.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/fimegezekaximojajowag.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/35301226450.pdfIn PDF document text
    • http://datcat.vn/2018/file/62993070683.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/55879835986.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342641d9b1b---64190735220.pdfIn PDF document text
    • http://spiregene.com/image/files/20210908_171943.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/48238701030.pdfIn PDF document text
    • http://citty.org/images/uploads/file/gitimebejoxixowokerif.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/mirakotemepofabibelu.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/jopimafexururijepux.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/33830797382.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/51696343583.pdfIn PDF document text
    • http://newmob.it/userfiles/files/88764643388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=default+audio+recorder+androidPDF 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_off0000b1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F9 14940 bytes
SHA-256: 2006ffe2642ef791b41ce0f6ed5c3a35acd782cd98469094d78dd5be0ac8de7d
font_01_sfnt_off0000d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 10400 bytes
SHA-256: c3df1c2ababac1c40dacb01722516d1df1ad2c915beef139ea24a3d814718025

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