Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a9ceb065fc2991…

MALICIOUS

PDF

83.9 KB Created: 2021-08-17 20:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 159669e757aa94464ae1c625d99ee22c SHA-1: e0e9507b71a23e1aba558e0cffe0b7168233bddf SHA-256: 92a9ceb065fc29912f4fbb8a308a76308bfba328953cbe11bf567d665d3ecdef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting it is used to distribute further malicious content or redirect users to phishing sites. The presence of embedded JavaScript points to T1059.007, and the nature of the links suggests a potential spearphishing attachment vector (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://faxik.ru/ckfinder/userfiles/files/witorezelanimedaz.pdf In PDF document text
    • http://chapelguild.com/images/usr/latunigafoxe.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d91966ea18079b2353457ba0861e2e5f/45200987273.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/g8p4ljm6p4it02utpp9ukmqu16/5560547164.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/70941044753.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/miteluvizitolal.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/98025581535.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/73c7d25fb4b42832db9f626c58a147e2/najegazekemudizetokeru.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/8d474e0e353ca5807643061853288f86/muluk.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/90766261396.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/demuretofexune.pdfIn PDF document text
    • http://all-premium.com/user_file/files/zuvujus.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f372df17c4---rusobiwamodozofaj.pdfIn PDF document text
    • http://beta-rc.com/upload/files/wosutodag.pdfIn PDF document text
    • http://ekotronic.eu/files/file/76552814767.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088758fa9e1a---boretuzef.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/j26ktg4g3ahi8h7bij05ldeinl/16884560322.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/wusutilininojupaze.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/e72fpuvftovdoiv8efoh9upj62/37109252715.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/gevijonutupesiruxerudafu.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/69808271272.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/63608ef5d55a0ff2c9c92a45d82f6a37/36108145675.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/17989600718.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/29710364818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kadhali+album+hd+video+song+download+mp4PDF 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_off0000e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 16556 bytes
SHA-256: 9b4721afc19742e087e1efcd47becf8886ba56aafc7e66ec03d2a84a52a17118
font_02_sfnt_off00012730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12730 11104 bytes
SHA-256: 18d7c17c6dae542c9ee6cf2d455a627e9d6f1da31ef8c7d08bce0c21d2300ce6

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