Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3bf838cf7f8280…

MALICIOUS

PDF

69.5 KB Created: 2021-06-09 18:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65c390649062df0dfd0e9db81ec019f0 SHA-1: 22be837a3d7764eb3da4dfa0ab655229b239d9ef SHA-256: fc3bf838cf7f8280a419de201865c376a66a0bb622ede9b1041ae220b859e677
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous embedded links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the PDF structure itself are indicative of malicious activity, likely leading to a second-stage download or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=2pac+songs+mp3
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989769661ca---sitet.pdf
    • http://isgsrl.it/images/file/dulitekix.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f7d2450ca25af9a2032545780c3150e9/dusezudij.pdf
    • http://applexin.com/ttpsea/files/file/levefudaseke.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8838589143---68826729495.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/tetexagasesuj.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3d9b37976---61178613772.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ra93che3f2cb0r9crpr10hbo20/xinoxajux.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tki9t9shshc31o707i0dd04ks5/safenos.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079e19b86799---dapolibakejeforanavi.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ejl54pa0g0uo2h7rh47fndbdcp/78601738107.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/aau03a97upopcrffqrs56o5ko5/nozefaxeboludizakitonutu.pdf
    • http://matstravel.ru/userfiles/file/77674875192.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0942f672---1838251165.pdf
    • http://agataklimowska.pl/userfiles/file/wavalerexerejejaxebu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d251.bin
fa1eee54d06b39ad815639eb60eeefbdfa773628761a94a6f9ede4ccc6b073b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 5324 bytes
font_01_sfnt_off0000e462.bin
8fd7c2f7d2623c8ec57be9a7dff5d52eb1ab45f67ddcb012339d56d4b173052f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 10796 bytes

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