Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ce517f8af56a39…

MALICIOUS

PDF

76.5 KB Created: 2021-06-18 20:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa66fe717fc2d3d3f6d147dcfb144dfd SHA-1: cf320a487613b4f2a47259ca7da41a5608f2b2a8 SHA-256: b9ce517f8af56a39a824ed7c4c839b85a2ba9ea490ff0e446704eb52765f7b78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains multiple links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of numerous external links on compromised infrastructure points to a likely download or redirection mechanism.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae76b5d2a---99448401457.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/4048536863.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ce5543e7519316e2da8c23e4a78c22e4/72720015602.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/409307540a33c5216b96e9e514ae6246/14635743010.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/nmgo0pqj9oqrgdlb8dk5ntjcb6/sumuzobekowiroxiwose.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7p6nqevo64kttcr0bvldv860c5/91055240663.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/kugr2u2thjko6m5k2apgfm7o2p/14341178188.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c57cf0f33---jiguwu.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7bc7928095f3331ad2bcdcf0018bc1af/23418513364.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a956f63f2c1---dunurufaroxonasonefobuwe.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b6991f7aa9bba4ff9bc7e91958a55b5a/wunin.pdf
    • https://deniz-sogutma.org/img/userfiles/file/71848439592.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9f3e90b2---lamokovexofemuj.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/sdu09vnrcmsqqs4f1jtafv75s9/wixesemobup.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/j7h3skqtkflii7tubt53to78hl/69694085471.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609000f8f1a0f---88340395358.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=10th+math+book+odia+medium+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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f5.bin
87cdd114f4231cd2b907f5529f936fa8ff3c6b5266616786fccba0e9a6905f23
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 5276 bytes
font_01_sfnt_off0000ebbd.bin
e9592ec927caee7ff5529080d72c22887ae71d98660a7ac8855639d83deefe4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 11364 bytes
font_02_sfnt_off00011261.bin
459bce48ce9e1ddd68d4892c8ff19f3d04321cb26bcae6ceabb07a504d97f3bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11261 4932 bytes