Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c11b8689ef940b…

MALICIOUS

PDF

77.5 KB Created: 2021-07-30 02:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 234b6ec240264f08715d8c8ee81af5ee SHA-1: 0a4ef7867b6bbbddefa46fdefe5bbcc970d68df1 SHA-256: 73c11b8689ef940b9e60ba37d61df5677b514a1e4daa9a5041ba7e46757b2666
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be to lure users to malicious content through a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sindonis.com/userfiles/file/36202680269.pdf In PDF document text
    • http://cuboni.com/uploadfile/hong202106300810035853.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/84536632541.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2330d768d2---41149359935.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/45225447486.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d44d702f2---fewadavokozazu.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/mokexutobux.pdfIn PDF document text
    • https://penal-garazh.ru/files/fotokojikurolomowokeji.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a574a5af948---gidigares.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/dotewudotemokuxotaf.pdfIn PDF document text
    • https://ahha.az/userfiles/file/54663644681.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/a28b2fe678420f308032c04cfd9e17b1/fideworina.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/9590c4c4a5f84cd7d6a356dc56e8cf6b/89296961172.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/vesijinegofifomugevir.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/gvenlbarf6afnfvfc91ekq9023/45423313219.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/kututomorabugusitib.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/90837895445.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/65734097821.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/kowofup.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/54048f47915c130747e0e7d3929d548a/wekubepilegule.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/13273183399.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff4be925f3---61731636638.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62e0e5adc5---jetevujujola.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/perixulexifovedakikafag.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/5ea8a3fb89d004c903417eb9d6d46043/85165814669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+wash+ag+jeansPDF 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_off0000cd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9E 16376 bytes
SHA-256: cb639a08cc20699b3d56b55fa3f73e2ad756eaad5ac793327475b971082fe03e
font_01_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 10356 bytes
SHA-256: 0e0b94049074c90b1f1482023763ea98ca2d456b73258d3bbd3b3adbca308d36
font_02_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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