Malicious PDF — malware analysis report

Static analysis result for SHA-256 9220e60d5fcd0a6d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 13:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afae489aebbca0840fdeddad0e5fb909 SHA-1: 5c1b01aa8a51525ddd3f91b2cbc69f9fea24619a SHA-256: 9220e60d5fcd0a6d4a9faa31429700ceb7c6c002521e47e9e4cb09b2ca959080
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dfdj62aqg19cja2200j164db9b/64051446547.pdf
    • https://daaeportrett.no/upload/file/kenin.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/1hobngv556qjtmtctunjaut30a/wodumo.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/21841185cd6016e8f8c4d2d02e3120d5/64270032031.pdf
    • https://travelworld.ro/userfiles/file/givoxizetida.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5d89bad6d76e2b9578fc60688360bda2/60358606394.pdf
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/resuxujefuwog.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/57544a7b5b867beab45900b0ea6c4838/63445837555.pdf
    • http://japan-railpass.info/images/blog//file/66464106528.pdf
    • http://bagiez.com/userfiles/file/zibosuzimakodixud.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3203a1288774672e946c8f01d69389ac/48796140195.pdf
    • https://altonika.pro/files/fck/file/3687223901.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5cc4a613a61bc711fc3c828288731fd/34512911165.pdf
    • http://whalesart.com/uploadfile/file///2021061604441082.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/na3phddcfct3lbav5nsginmjhe/gagonajomumiwilelijix.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/83279808811.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/09d454916abce81677de2e89953b73e8/59199799573.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d886ef266a---97751013652.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be5078443f4---rejabimafixuvufazevajik.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/nemokirapoderesa.pdf
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/kexoreninopato.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/mum4m0qj2s3l75qhe0k4gbr1l6/87348436713.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6c9a08c46---84347588213.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=leucopenia+con+linfocitosis+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_off0000d8ac.bin
3d52cc0ac014269d7f1d3a752e234e8c1792c8187c6fa8d5213488d2ff737f11
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AC 10572 bytes
font_01_sfnt_off0000f0ea.bin
233c5907b772d0985785a9dd960a601756d0d396aed78d4e933f08cae4228817
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 18044 bytes
font_02_sfnt_off00011fe7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE7 16792 bytes