Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cebdc4e48789eff…

MALICIOUS

PDF

87.5 KB Created: 2021-07-18 13:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 654f64d51139f06368902070366528b1 SHA-1: fb0c5461bb5ebad2ac3975ea490cea418bdd74a5 SHA-256: 4cebdc4e48789eff2c55f63a6d610fe31b98cc6bfe3486a17aa4bcf3964701ba
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution. The document's structure as a link farm suggests it is designed to lure users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.lnk-creation.fr/upload/file/vigunitibug.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cee0c2e01bc---natadaxuji.pdf
    • http://szrealty.net/uploadpic/2021-5/file/2021050821521373499.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d44668c493---mudaxipusefolukuma.pdf
    • http://ilturismoinitalia.it/userfiles/files/pezudolo.pdf
    • http://v-lukomorie.com/uploader/files/luvakevopekedilibojexabo.pdf
    • http://herfon-machinery.com/images/ckfinder/files/20210627195942.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bmq590uckl9icf44j69l1bm6u2/vuviredadinapewana.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3228247cca794e6d266c95f41bc3eedf/zozir.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160923b5a10749---14199252916.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0250c89cc8d495ef6679c6350f50c5cc/rulavetemifa.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33133298952.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/4b464bb45147f8e65e0dbe46ca3ddd00/gasoritikogemozuzigepije.pdf
    • https://angkortaxiservice.com/userfiles/file/bevugevedu.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/fse3njjpjo45i80cq1f99i0fd3/89028022156.pdf
    • http://kulturazebrak.cz/userfiles/gimokobuwo.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/145df653dd989bf1c7f92ba8c0d0902d/ferososurezasosivof.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa979b57630---84619261995.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097e73fda707---20491085312.pdf
    • http://currycornersugarland.com/admin/images/file/58997259300.pdf
    • https://clinicamanila.com/ckfinder/userfiles/files/26945537046.pdf
    • https://coevent.ru/upload/files/84117965192.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35cd8ccdd1---79279690934.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079758b59361---51643490974.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/0c08d874775ff6df34a686482962976f/mimopukelixurudut.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160f3e0c8c9b4a---69393574051.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d63bbad1a7---1731130926.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=slicked+back+silver+hair
    • 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_off0000f3b3.bin
b5fa754353405b29a9b373c5afa6b45fdc85dff4f7dcafc55fb90de062a16ea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 10516 bytes
font_01_sfnt_off00010bc0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 16792 bytes
font_02_sfnt_off000123d2.bin
eb092c219cf4f9c93ebe57d63dc4ba5eee57fde5434055d1c401ee955da66fb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 17080 bytes

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