Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f4ef93a07d8f2c…

MALICIOUS

PDF

80.6 KB Created: 2021-07-02 10:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c8210170706d64bf20d418bc18c5d827 SHA-1: 3f112d7e3e39fa7fe9638257a95e8a34ec78fcc2 SHA-256: 69f4ef93a07d8f2c3b1d4c16e2112ed2515625994b3430ebd4aba0e7c309a09a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised websites or disposable domains. Heuristics indicate a link farm pattern, suggesting the document's primary purpose is to redirect users to malicious content. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://brmxn.com/userfiles/file/20210521141724_n38ez9.pdf In PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/vamusaxo.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de3e25f1964---wizubexuvalibigoguli.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a75f6a7f2---savorimegu.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6881287f3---89830987188.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/nukanuxitedanepe.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160912e2eacd29---ruvuweva.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/rppk7gp0ad0q3srqe67qq8q866/7288455715.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f9fa8a8c6---59924832468.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f085dba7bfb498b1f6dcb9ae98f3d481/86408192177.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/cdde4eaf1fbfbc4fb5597f2843bd0ef0/48036043503.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/vuridalafikab.pdfIn PDF document text
    • https://limsurdua.com/contents//files/rigalikivijeloke.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/nonosojipobawed.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/51772007566.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bb7b4a3a8---sebaledat.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/0bc32a309dff55a2f61dc8844c4a56f3/4730758646.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/73118930627.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076188c61d99---77022249115.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e7a7767ac75949bb0002f0a34a76651b/60385498072.pdfIn PDF document text
    • http://distributoram.com/files/file/xopabilo.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/movuregukaturoladokeji.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079596069490---mopizadavuvatedenivol.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e7a177a7892a80ee78dc0d0b028a99c0/vuvoxesira.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f46c5911---87366003981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cardiovascular+physiology+concepts+pdf+free+downloadPDF 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_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 11296 bytes
SHA-256: 00b6ef1ee8b723364d1bf59be1cc83edf7f0531258d26996a33e14355b735ef2
font_02_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 17332 bytes
SHA-256: 39171613057f04133fcbf20d247f43c8ba582e4db57ee62288deb55c8536f972

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