Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b25bc9efbb964ed…

MALICIOUS

PDF

86.5 KB Created: 2021-07-01 21:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f75ebd8f5740f13605b6728b55a996ee SHA-1: e054c52ffae11dea039044e7378b2196daee436d SHA-256: 0b25bc9efbb964ede35cb887345c5e211f2d2a73af40618e5968ee1d9bbcd0c0
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal the document functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15994efa6---55226914093.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2a6160a84e6a0e0f0993c72bcd4dee3a/tivikuxuwigenel.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b761855083---64158338028.pdf
    • http://drjoecarver.com/clients/49355/File/wezere.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9127b83ba8---sokuvigujaxipiwif.pdf
    • https://pima-alarms.rs/slicice/file/xigalefobelalen.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e531005889ffb92b192e2181bcbe6d68/pezuxaxusazizuwozomaxujux.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4c8f265b---viguroxig.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/famarunesof.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b11e3d389---79483464078.pdf
    • http://csptech.net/admin/userfiles/file/87594858782.pdf
    • http://alphasigmaoverseas.com/userfiles/file/majisosofixuruw.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089dff8111cf---40656233064.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607322056e382---kelugigib.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9d03d8ca4aa0fc8de461c08ea9ea08fe/tunowagom.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6a1119ba7---xugivepuwanereparewelulef.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b77293d2999---88036032394.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3b5vb1s7aostc2q7dlglqcpa1/91705484344.pdf
    • https://nabsangram.com/userfiles/file/57385007639.pdf
    • https://rugsinc.in/UserFiles/files/26492652166.pdf
    • https://adsbudget.net/userfiles/file/botigo.pdf
    • http://anthonyvienna.com/sites/default/files/file/65958996451.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5qum1ktmmg2bvjgvpkmajevb1m/womapasos.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/xusezaxewa.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca160d8029---27330408209.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/34ec15d1i5vh5a6k5p1d5e4vot/16773577117.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=list+the+components+of+a+computer+system
    • 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_off0000f067.bin
e93a81aee2aa001f24df4d27760fea6074e9ed4d95c3875518ce8c72e13b5c82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 10872 bytes
font_01_sfnt_off00010964.bin
66b0cea9d3ed6f877422c31262dd7011a7867bbb43c1278701224965f2318f6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10964 16520 bytes
font_02_sfnt_off00013452.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13452 16792 bytes

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