Malicious PDF — malware analysis report

Static analysis result for SHA-256 227f05bc1ab9e9d1…

MALICIOUS

PDF

96.2 KB Created: 2021-06-29 14:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b45ffa9914b8ec45c751cc4a9148b27 SHA-1: 2c67a1fa5fa1cddd5356d4e48a7ec85b6adc100a SHA-256: 227f05bc1ab9e9d1e00b17bd35b1c5ca21d48b7e7cd4200a3db6c4ebe9c99ce8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine rankings or redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern involves directing users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 https://crewmak.ru/uplcv?utm_term=how+long+do+prickly+pear+cactus+live
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/k04hh9a00q1om2riesogpntcj4/fereg.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a2eddf09a7d732866dc3c81c31c56122/wukozudureparoto.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/36806655223.pdf
    • https://ajitcoatings.com/uploads/suxodezuxasitebakif.pdf
    • http://www.colormotion.cz/UserFiles/file/sanokujenokodesavipe.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/l394cfufdntmtvh0gglv03ifi7/rimusidixeken.pdf
    • http://aqbnb.com/uploadfile/file/34061686380.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed1c8e6ac0---guzadepudijo.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c146f010f3---77471662886.pdf
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/gazoz.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/v60r2kte9809niboqjnd3utf26/80542128711.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/36aed2d294eaf6a8611520efbfeaa409/76919379256.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/24d4a1f913116e80731c5b3d748e9ae8/wajorabadufogave.pdf
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/kerirosotisuw.pdf
    • https://cottonweb.net/userfiles/file/75166627828.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/021632311e140edb0336c4fb24c216b0/terujaluxijox.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce52c1830e---ziwegoxoz.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c3489e3d1f8312c25a64fe82e103c276/19978609518.pdf
    • https://stillwaiting.org/userfiles/file/nakukutesosexamixusawav.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b0ed29e8a01ca99e61e2313d37150611/41402738177.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3f999782---bivafi.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/06aafd21350a11f680f7eee11717da36/gumuzofakofepez.pdf
    • https://dienlanhhonganh.com/images/pic/file/87912853405.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/44460bd736a1ec9700e724ee2b7a6b10/wutexozeduz.pdf
    • https://ystechpro.com/nbloom/fckuploads/file/52053943437.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fac9.bin
052d5028f265ba45d27ebd3757d98dc784c2355e5949715ff6bcbabc85b1cee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 11136 bytes
font_01_sfnt_off000114c1.bin
8d42ad633fc23360dffccbcb8a60f964093b35b714ddc11bb200e6ff2be233d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 17160 bytes
font_02_sfnt_off0001405b.bin
231a0e06fce879489f9aa1d96cb059ba289237c5c7ed6d22f1288a45ad7fea3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1405B 17556 bytes
font_03_sfnt_off00015b03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B03 16792 bytes

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