Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b56d50e83bbc84…

MALICIOUS

PDF

85.1 KB Created: 2021-07-04 21:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae5617b84d72d1ebcbe2a1576e4c9d88 SHA-1: 5d490bccde39cfb0be747b33f9f3edcc8268ef12 SHA-256: c1b56d50e83bbc849f02813794bbe5e6ceba25a36343735160a5fd1d0264a83e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jkbprivateiti.com/userfiles/file/lukaligabonokum.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc5fa72d08---95889790794.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a888f27b72a---50928095539.pdf
    • http://asiadomainstore.com/userfiles/file/lupemufumoraxarobopo.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/fb27be20a329d33d1b9f2bcbb5c335fb/82348329125.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09675f1a20---7253305179.pdf
    • https://autopratichesas.it/file/79500439033.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718c938cf7c---sadevel.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/64487713936.pdf
    • https://nnt52.ru/userfiles/file/84674301687.pdf
    • http://web300k.com/upload/ck/files/kakipewojulomezewuges.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd047716559---vowefonanefa.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c09d649547---34078220524.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/75d179dced9337be15ac40e4d1615858/kebamob.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/2aevnejsa7ojiv8efl55ekbg3d/ludigomezutoti.pdf
    • https://rrr71.ru/upload_picture/38524319655.pdf
    • https://adtw1.com/ckfinder/userfiles/files/49466935032.pdf
    • http://wecans.net/_UploadFile/Images/file/gimevu.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2ecb1e736---giwetaw.pdf
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/i27p40ucoa02prq73iv75jc3fd/36597300229.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c57b0d171---misipapobariwakakam.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/30125837156.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f79009d57c5a54bf6f4bc220a4d7e6fa/taxadedowaxodekeradi.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c08bad82f---zavopobitunenosapipu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bmp+to+ico
    • 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_off0000eb3d.bin
f499105f9926b83d90e0c3fdfbcd5f2e4861e3957ac3574a198ad786a4230e47
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 18284 bytes
font_01_sfnt_off000119ae.bin
bcdad5a8420b57439bf69f2ab0ade08a252b55db3d0dcb8e25a71dc0fa680201
pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 9876 bytes
font_02_sfnt_off00012f75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 16792 bytes