Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efe694b7d534d50…

MALICIOUS

PDF

91.0 KB Created: 2021-06-26 00:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 843096ffd2885a91ce923892ee7bfd22 SHA-1: 180be4b91c32250655ed6f8d4db0f3ebda6576c4 SHA-256: 8efe694b7d534d501306b78646e4a5542f78d756076373c3a021493f024d463d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to other PDFs hosted on compromised websites, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a614dd29c2e---61736051350.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608471a8141b0---55456097206.pdf
    • http://aaaexpressac.com/userfiles/file/zerotexolosomef.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/462bf6e1b73671a971a3157a93463113/genebugizomemifafasuwaniz.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0e9ef2b2179f96c67a26e5407e17cc96/28677321153.pdf
    • http://eurekaelearning.com/upload/news/file/71504514504.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/0dbb384eed0aae59d82afa477271936d/mugexixarimorotibunupowur.pdf
    • https://tortugafilms.ca/adminfiles/file/67855648335.pdf
    • http://lordbeaverbrook1973.com/clients/76835/File/1953100072.pdf
    • http://didocrosby.com/imagenes/file/rifafufuzimorarugadoxazaf.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t0eht1b7mrdptilh9l259ahj92/20047058760.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093e0b190842---juwezepuropid.pdf
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/27135746256.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f914516e6a---vipitejuxadokilariweta.pdf
    • http://akicgiyim.com/userfiles/file/nimafosewaxete.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/52f342877ce918ff4d95a043aabd1fbe/96909158626.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608496dfa16dd---gusenekenuxigebilexugu.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb2afbf030---lanumipapober.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/jotedijunanofakuna.pdf
    • http://agcslohian.com/userfiles/file/60913563447.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/jaluzomekediponotazomova.pdf
    • http://texmet.pl/userimages/file/masut.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608450c5a6efc---pololirisu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=red+hair+to+blonde+ombre
    • 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_off0000fba1.bin
3af561cd05e8b7a217101095e594d0e34da439360978e4b40634818a2b5928f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA1 10528 bytes
font_01_sfnt_off00011357.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 16792 bytes
font_02_sfnt_off00012b69.bin
1d8b24b2db6c4d61f61dce463a36ec097fc085e92b688a026475aa041837e3f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B69 19536 bytes