Malicious PDF — malware analysis report

Static analysis result for SHA-256 327da17d69476050…

MALICIOUS

PDF

76.5 KB Created: 2021-08-20 06:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f532a2e2832aa5e5c67d9cf8d300bcc SHA-1: 8828b04619d4c13b25b6edf7d66a86204a604a17 SHA-256: 327da17d69476050cedfc6c59b1f5a648ea77263aa64d79ffb766797a0f2a82b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. ClamAV detection and ML classification strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0227c0bb14f4668b832c44211a1993f4/62272982359.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/110bac4375f901fca65ae6b1783c3469/5220023072.pdf
    • http://drivingschool-brno.eu/files/30816595541.pdf
    • https://hpsoft.shop/upload/files/97939620799.pdf
    • http://floral-design-lindgens.de/userfiles/file/putuvedu.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/veutvffl8ad2objkenhe10grou/80018929501.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/6s4gbfsnn8poivro4tn4a4dvtl/47222270125.pdf
    • http://danies.ru/ckfinder/userfiles/files/minigidavilisoxojo.pdf
    • http://career-id.org/ckfinder/userfiles/files/kereziwebomofupu.pdf
    • http://www.proyecpapel.es/ckfinder/userfiles/files/40122375063.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add460728e5---muzubos.pdf
    • http://membranekeyboard.pl/_data/file/mapib.pdf
    • http://bigandtallking.com/userfiles/file/38655905262.pdf
    • http://bellina.pl/userfiles/file/xolijunuzideruba.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f60d25c87---49998216851.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/89786510c0c1320a8483126728b30aff/4169998933.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e310fd27db---9669912806.pdf
    • https://walnutcreekguide.com/wysiwygfiles/file/golukoxa.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607741ae0f60c---822062754.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fea7b0e3293---kukif.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc63488053---marogadamowo.pdf
    • http://mofrantech.com/userfiles/file/63415641323.pdf
    • http://langeline.com/ckeditor/upload/files/59404655614.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=glazunov+saxophone+concerto+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c696.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC696 16792 bytes
font_01_sfnt_off0000dea8.bin
20b9a7711033945a654ec44b81371e025e2804777bd25a0749ae8f981e87613b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 16516 bytes
font_02_sfnt_off00010948.bin
1c0d8697de7433a6d91c679f5d2ec076d05adfc4437f7e048a75ef4c9283c3c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 10992 bytes