Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab15a915553fb44…

MALICIOUS

PDF

81.9 KB Created: 2021-08-26 08:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 789fcd2f84c2476348d98a4543f64456 SHA-1: 1d1df74581cc02f0ab0cd1b5dc5565e345d5a3e2 SHA-256: 4ab15a915553fb44a8c5422a055a4edecc24ef4535a07d1b4c83f99a5159fe96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple compromised WordPress sites and disposable domains, a common tactic for phishing or distributing further malware. Embedded JavaScript was also detected, suggesting potential for client-side exploitation or redirection.

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://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/xibikemijukalagij.pdf In PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/zononelurozuzewopewaz.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ba1dfdd1---doruwigilevadekokizuri.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/vununekalegowoniretusola.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2f511c49592d179d8a167e3138482077/88353201226.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/lafilabaxugi.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f8a62c728---rolifuzubibijexebigusovid.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/99c85eec9ba94fae4dfd3ca977b52c23/44536883553.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/jumibaluzozof.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/59163194421.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/6203087588.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/madovajujokitagem.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c870be21e---sixudopoxo.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/23037241561.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/22398657266.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/lejubibuzapexatus.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/kusixamifiw.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/joriwedovojujif.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/41f81f76b3d5f0bca71b6008c05cf485/xizil.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/guredomajikazefejosigo.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/48426345652.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c5596e7a---43179113116.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4fd31c297824e0057d3d9d068d210e37/latejilawoxuw.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/jujore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=quarts+to+cups+conversionPDF 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_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 10544 bytes
SHA-256: ba4dc77753d189ac384196b204840c80035ac2105049aa2c268f4a23f61e6f23
font_02_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 16524 bytes
SHA-256: 99dff0e991778440d054e02304f7d9541014d54d8ac067ac9c442ae5bdf08d9a

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