Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3bdf23695e9c04…

MALICIOUS

PDF

88.3 KB Created: 2021-07-01 17:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cf045d57075928fb3acbcf688ad19f46 SHA-1: b6fd012e5153f28d640e7d923a92d515e3e8ed44 SHA-256: 4e3bdf23695e9c041519b52003ff09c17c0e16c16c19cb207c9c82decaba3fb9
96 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. The primary goal appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d71841b53a36262e0f70427bd0c331fa/kedemokuvisotimunipes.pdf In PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5e23b721bb5b0133a7ab4093e65ac360/lisaxafokawuxeku.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5aa61e751---gixaforowovojugukozodi.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/67505624243.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/mawuwazapevizewitaw.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ae5098j0ngshavglfufkvnuoea/xebolawudad.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/sokakewaladini.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/difage.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/68130931822.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2c8e2429---49864224458.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5banuuna29abvt59oro6okc52r/9848351218.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4afdb85247---wutufog.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/47512951518.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/62144906235.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a21fa84d1f---97212228473.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e66ec0f9fb---54899285219.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/vibovexijusumo.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/55629250038.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/47277194687.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8492b39e---93660817766.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fujudulu.pdfIn PDF document text
    • https://medtek.vn/storage/file/suwifagoxolegilizi.pdfIn PDF document text
    • http://huntland.hu/upload/file/53834327998.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160802179a7535---nanavovonatubutob.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/99263814686.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/xebakumivubizujososula.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c9cd2131e5c7a4c5a133bd1db60a2ad/67115341071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sublevel+open+stopingPDF 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_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 18668 bytes
SHA-256: 16ae7da7f49d01cb7332ce1e8927ce98ed552c47dce359089a763f31596fe17c
font_01_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF3 10544 bytes
SHA-256: 6b443ed7a3b8e24b6ca028d9a217eee015aea362931666c643815d4194be749c

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