Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c30ebb62f2d69cc…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 02:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b6b4bf1a707719a928b8aaa48fe23909 SHA-1: 643c1d1e76b3af9b94b0556ae43ff8efdbeb25fa SHA-256: 6c30ebb62f2d69ccee45f6cbfa957add14b2847e16d6fffea23ad94cfe93f155
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, suggesting it's part of a link farm designed to redirect users. The primary attack pattern appears to be leveraging these links for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.horakgolf.cz/ckfinder/userfiles/files/65226508212.pdf In PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/melozakijawef.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a779399ed1a26e07d6fa8298c686c9f1/xitefezobixuwip.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d507132c6d9f6e8bd9dc014b24a39dcb/fogix.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/c4a477f19262dc648b0f10dbd9a4239e/kabujinaz.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630119981.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/rf892h5epm8jc9313bdmv2l6ou/rafoxalofuropomi.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d3855606c45851c1ebc37f8a9fad82f1/bakifeloxeri.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c301fd83b6cd9319eac625ed488389f9/90049203585.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611a26a985ede---mobusukigu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799625d64a6---56375286290.pdfIn PDF document text
    • http://funperm.ru/content/file/disunudujefokegulapatidi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e18fde45e---rimivesasabomesuzuvezed.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/33204859316.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/23623930141.pdfIn PDF document text
    • https://chpcentre.com/files/file/pujazipijawidaleduf.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/86424592358.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/vafamasededol.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/49008363193.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/5416187726.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/waxofukixebuvobibet.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2ea994750---dinerasetazuxe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b21113ee335---36325488126.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/fejorutafawegaputodiloti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=english+grammar+practice+paper+pdfPDF 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_off0000d1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B3 17384 bytes
SHA-256: f0a65b51cdf149897b5626b0c80b90253e1fd6a2db42925dc5788c5531c846d7
font_01_sfnt_off0000fed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 10932 bytes
SHA-256: f36a73633d8301cc5b51344e74695933a30b549d1c26adadaf5ae264cb9b1175
font_02_sfnt_off000117b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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