Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f1f3cd0194e91c…

MALICIOUS

PDF

94.7 KB Created: 2021-06-26 11:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67bec7fce5fe48bea74cfde30b7ec020 SHA-1: 1d26df9215e143233ccf0f9913e3263807bcc65e SHA-256: 17f1f3cd0194e91cc6a479552979278b2213eb7ed4635b809b28ecaa18b81f72
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf7c2fbac---tupuwukovoban.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ed1ea82iolqj7gh1ihuv5s26ff/kegufufedadisemob.pdf
    • http://creative-format.com/upload/editor/files/kixugesirigilolutog.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b79e7398bf---49767979931.pdf
    • https://sonntag-immobilien.lu/userfiles/files/vanovikomo.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf45fe5a94c---27105646237.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vcf0bnmsa0ll8it9g5bep1nhvv/88892377873.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d4a9f42b40ef8d5b66119dc66aec5631/gubozojov.pdf
    • http://adamlegal.com/userfiles/file/35070660306.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a0e70be8---19054507700.pdf
    • http://tomaszskiba.com/userfiles/file/60841136730.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/bedam.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/82ddehqpiqdjnbvvviviqtki6c/64970885152.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f52c30b63---93058538675.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0fa67989---fuzulasu.pdf
    • https://tolgyesvolgy.hu/userfiles/file/14911334414.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/d2pfbp64hr2s1g3nltd7776cah/31740527978.pdf
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/wufowutufelugili.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adc1e0df8b6---nuxuwepejifekeganutanil.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c823aa6073---69725443327.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3ac975a72---69689284153.pdf
    • http://i-daa-wl.de/userfiles/gifosoxetunonejigejuneri.pdf
    • http://boeschfamilytravels.com/clients/43210/File/ruvazoseginefareredemeve.pdf
    • https://novamakine.com/upload/ckfinder/files/xewipebivev.pdf
    • https://dm288.rs/slicice/file/vewewuvi.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609405487ba95---43001424876.pdf
    • http://libron.pl/fckupload/assets/file/54116306601.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0006b41c0---pawejumote.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dividend+policy+examples+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_off00010bd6.bin
8eb68adb2ecccdb2842e3826db56a636eeb519ab600d5bbbcaca28a07e3ca76f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD6 10868 bytes
font_01_sfnt_off000124ee.bin
51bdd24a8d1ba622af38b47aff519f753365a3cd732eead742b3725e5ca52dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 17672 bytes
font_02_sfnt_off00015382.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15382 16792 bytes

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