Malicious PDF — malware analysis report

Static analysis result for SHA-256 82610c4a40814804…

MALICIOUS

PDF

94.1 KB Created: 2021-09-07 13:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b0d681f63ef9efc78a66bb03bd155f2 SHA-1: 5a23b32ad89add71b6b1bb598101f2ec224312b6 SHA-256: 82610c4a40814804f7a1d9701e39c53c27a55408002824679e92822146c138d4
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and is identified as a link farm pointing to multiple compromised websites, many of which host other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/uttvl95eh98m651b07n9r7b57c/42851772919.pdf In PDF document text
    • https://aymsoft.us/aym_image/files/xomoledizodawevogafatudex.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/xajunasizofaw.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/541j445hvc9d48drh7nn10pmqk/56053153690.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/doputela.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800a9a9cac3---fanutur.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/m66vm63d2qj9bgo6j8tpbj25ah/17715049557.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/wujupidezikag.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/13679802178.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/6jabplh348u0g24tbroftc91a2/potixo.pdfIn PDF document text
    • https://anakmeong.com/contents//files/17502849740.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/45072719023.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae02f7524de---wezutosezimapiz.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/96850039513.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607824aacc04d---xodiwe.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/bosesunodediwokaxoge.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/fagomupaligase.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/39f7b40bce24e360cf8e7e12acb4a598/jajebosabogap.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/10500342426.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/dce7257b4eaaddb0224a7a8fd284858c/99320019898.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/20844866616.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d7886259554a5d653fbd6f115101a23/vejujowo.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/dum6m4caepq6dj4dbp8qmvgl53/fuporonerepolewa.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/f1cmv9js44r3unusp6hv1viq87/fuwoxozazobewiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rccg+sunday+school+manual+2018+lesson+2PDF 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_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 11288 bytes
SHA-256: 1dea353f884e51d1ba6d365fd798bc5e19982446726dbbdc159d23a8fb8e9b70
font_01_sfnt_off00012117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13929 18264 bytes
SHA-256: f917e5da44169a16072cf96552052a0726939b7630571e34b901114600f660e9