Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4064e593e8b4d31…

MALICIOUS

PDF

83.4 KB Created: 2021-08-16 10:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0fae143cffc275b97ebf24919b36c813 SHA-1: 4c385f759c248d1f090b1981046f24edd0be7e0e SHA-256: f4064e593e8b4d31089a67b46a817f415b6a8b19e90cc1be470651d95d2b437d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/af7800a3084a2516e6e0c12722d796a5/99156029017.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075d93059d3a---wiser.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210609_032945.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/33845105219.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/sugilinas.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5t2ml4e9q14gd3627ffk0c7q60/37675390480.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/33364972648.pdfIn PDF document text
    • https://successalpha.team/upload/files/19832908627.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/mumifusikulu.pdfIn PDF document text
    • http://sdds.be/userfiles/file/94221620875.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f3e2f5d66161bca3b2432417f47b77a5/55109647068.pdfIn PDF document text
    • http://halmar.info/userfiles/file/18750266330.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/ralexibuvoxazin.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/janosuw.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8ea9b0e7---97454583088.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/nepotabozigodusifufubet.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/64580765863.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/lawanigexetepiti.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/41tv8rn63bke6iq9tik3l3fn5l/47687196360.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/vetol.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/51997301310.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e667b10f961---5849695498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+i+reset+my+canon+pixma+mg3600+printerPDF 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_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 16884 bytes
SHA-256: be4e73a6986545af90c88e24d10533950ce96a5826b213302d73ff480c920071
font_01_sfnt_off00010b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 11568 bytes
SHA-256: ee366a67c72f2a4fc180c4fe3ca50ab88413efc69cfb3f34e3f774dba7c72da8
font_02_sfnt_off000126f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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