Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2459a632300094…

MALICIOUS

PDF

75.6 KB Created: 2021-08-29 05:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cce0a31a2e8b53b4578ab569ba6e75a5 SHA-1: 2cf51cb1cf6a9daf440f77e3b67649415a6ff2f5 SHA-256: 0f2459a632300094b2eb61554ef050601867f62d947376dadd0120af726b8406
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristics identified multiple links to potentially compromised CMS upload storage. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 5

  • 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.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd394a77b9---wujoginejen.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f426e4bd0---zovewodoremibov.pdf
    • http://alt-1c.ru/userfiles/file/45362758118.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dedf885b85f---51807864973.pdf
    • http://businessnavigator.in/ckeditor/uploads/files/duvimunemop.pdf
    • https://lesfeesdelhetre.fr/upload/files/27327741034.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/6d9cb487abad5deded4a6a449e7d2d19/gakedodejidakiro.pdf
    • http://dansecyr.ca/pdf/file/90704284597.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb39a6dbc39---naduko.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5f2bc239bee35122ed8cd87916ffd035/86790327676.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/fuvido.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c083c22129b---kunenagojixixowira.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f32898b8b8f---mubusaleresuwum.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160834bbd629e5---54592916867.pdf
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wulazorudadomizonirovezu.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/guxezilojoxojefalifeto.pdf
    • http://swaminarayangm.org/userfiles/file/53308044917.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/cbc3e3042d6b41133a3e506beab5b82c/tubedelujujunubu.pdf
    • http://www.tramag.pl/upload/file/dawozazetidibodagalix.pdf
    • https://asthasupermarket.com/userfiles/file/vilusizafanit.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a649df1da44---75607636442.pdf
    • http://leruichem.com/upload/files/bidexibakoxarev.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8daf7cc1e---sawufixijenozifomirifeziz.pdf
    • http://mingmitrcoffee.com/user_img/files/xakuburumefakoj.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/58859697100.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0718/985f75e813d8d31f2541574eff03ecc9.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6934f3a4f---39977348340.pdf
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/88349944676.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=all+source+shortest+path
    • 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_off0000c0ca.bin
ccdd3f8060aa65e6d0402c030bed189a57722bd2fbc5ea91eb4fd4275982bedb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CA 10356 bytes
font_01_sfnt_off0000d86f.bin
da3a234693f89bc3f77c4ca46ca434a0e8418b761690e258c959d223b9b72798		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 18696 bytes
font_02_sfnt_off000108d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 16792 bytes

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