Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c80099b39c7c971…

MALICIOUS

PDF

74.1 KB Created: 2021-08-26 08:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c5077d21c37425c4f88aee2140fd5c15 SHA-1: e8cdc13d36b1e4f0a19f4b1e51bc44e4ca26529b SHA-256: 7c80099b39c7c9718e78fa35a4b347945b44467fbb14f3775cbc973d276ad776
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 http://www.alexgis.com/siteuploads/editorimg/file/poleliwugilorozaw.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/r10b26h8npnvanjulip2saq8lg/34747926723.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a403aa036---57158448825.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/94574653692.pdfIn PDF document text
    • http://iwishop.hu/file/32472085780.pdfIn PDF document text
    • https://linardi.ru/files/file/gonipubipijakuzejijonoga.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e77565e00b5be67e5d2ad5cde918c064/38822555257.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/woxelanufusufax.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160763c4044005---sosikuwobufikane.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/xubukafetupovobowobekaf.pdfIn PDF document text
    • https://slide-bearing.com/d/files/71902605841.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/13141431420.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/31315438517.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/98999425090.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1625878874nopilozurojokipimav.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/ruxuzaxefatil.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/ruwusa.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f2043fa4d141367532bc7269fda7b16/gupirefuroja.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/91239676090.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3637da665a---83213513731.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1360a272fbb7d4090e5fffd4d702e080/44026656379.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/suvidizojefiwib.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609aecb636c0a---buluxoxub.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/nolekadololutenezobul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=c+programming+in+one+hour+a+dayPDF 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_off0000bf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD749 10772 bytes
SHA-256: 60bbf610074d59c2f0f0af5c81473419f4a426086c8d9fa0636492ca6b699352
font_02_sfnt_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 16692 bytes
SHA-256: 4eb264b1edb7dcbc356119f83f640cc5b4830e0411ecc5b59895d71485b577ca

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