Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d32bb24112dd65…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 21:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e6fbda904ee0369aeecfbf98ae79e03 SHA-1: 5ecd873a95825f5487221136e51f771b6981f1d6 SHA-256: b2d32bb24112dd65d65427424ebac16cdc5ffa1f61d6c55536f5ae541d133b58
172 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories and disposable hosting domains, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate its malicious nature. The embedded JavaScript likely facilitates the download and execution of a secondary payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alternativecarrepair.com/userfiles/file/73252368297.pdf In PDF document text
    • http://www.addvanceo.info/userfiles/files/rotutebujulemejedagu.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/warid.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b8b9c28cbbc3e42390d42a0b7cd7227d/nefapapuriw.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aba26a95ec---juvanenif.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/97732093293.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/91785959040.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/tuximekagefukorudavurifan.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09db79ab3b---dikugubojutosuboxarexa.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/31019010049.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/km6vh58fakmb2gcll5ojce0ube/49748678395.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/11414830455.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/99252165244.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210801160820.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091376b63b81---39878031180.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7d89a1f716cf44bbee7065309f90b6de/tezugozevibolarotab.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1ifqbp1acl1orhmrofncndrhg0/88363130232.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/8494691171.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/66577666323.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/49893487891.pdfIn PDF document text
    • http://benthanhfarm.com/images/uploads/files/56043708332.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/fonovo.pdfIn PDF document text
    • http://agama-rc.com/upload/files/gumitidiz.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/2008057738.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/76a3f5c7b0c0088bbb9f5e9c6f34fad7/45069826619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=artist+statement+worksheet+high+schoolPDF 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_off0000de36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 18184 bytes
SHA-256: e55cfd4415ddc1267e22b6c12d03e16850d23034b7f6c8a3c861574d70fd9628
font_02_sfnt_off00012486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12486 10836 bytes
SHA-256: c6100d2204af546a345112e9698dd26a741d5de0cb0620d37f187f0f3e33f2ff