Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ac3533a319abee…

MALICIOUS

PDF

88.1 KB Created: 2021-08-19 04:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8dfa6d825b7bc920fea231eb5ce11d20 SHA-1: 08056bc50f18c1f36b7db2e9fee7150d8ba9e342 SHA-256: f6ac3533a319abee042f1c2f4702c97f8ac347e55e1731df4ecc371e0fd34cda
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to various compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous links on potentially compromised CMS uploads further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://foodphotoshop.com/userfiles/files/71220980409.pdf In PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/cab987b2b3ca24b8069a19285e79debd/kinusorijisi.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/subokufaluloj.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ndfmopko5nu68j5u6bitr1p756/sodizegu.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/93621995946.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a5866aad9bda8fe91575e79c82c74507/dufekujofidej.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/kuzurafigatasitenafogoka.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba0223540c---zuxonopemuxepu.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/91904661264.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/cfs6cqi373kmfa0uf4k19k3nhi/28785734182.pdfIn PDF document text
    • https://agatanorek.com/files/file/nutadupuxidisixam.pdfIn PDF document text
    • http://cosmoscm.com/contents//files/jofefazopinowur.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/68847298881.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7986f3ad7b---27131385652.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e1d021c4729b4dab9b082667497004d9/kexodop.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/danamu.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/79170552810.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/6fad5bd8f429cc0292827092b5f02027/tisonarasas.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/7ebd1b637d846dd007986eeaf2dc0436/kivubapej.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/71043851705.pdfIn PDF document text
    • https://capecoralliving.com/media/file/12572339788.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/18e6cc99867435f4f08480dadea1cfe2/79429467107.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/besewafajizunowuvopikab.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a9683cd56fc---fadewuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=partition+piano+claudio+capeo+richePDF 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_off0000eb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 10544 bytes
SHA-256: 09c654f071c1b182e84a0dc91c64a1a85d0bf4d2b76d56f444e68a83c37243a7
font_02_sfnt_off00011b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 20548 bytes
SHA-256: db1b802e283b0f3fc7b7cbb322363b0278c8215857ada63a80ed9ec11f3f5070