Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df3db3a57a917c5…

MALICIOUS

PDF

87.6 KB Created: 2021-07-17 02:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 93fb7bfaeb774f3a50e6cbe2d3b30c46 SHA-1: 7da634a987755764bc646ac48aeb92971928f381 SHA-256: 3df3db3a57a917c513516de513e58dc24204f3d00c79268d4cd984420c698beb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, a common tactic for distributing malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://orchid-daikanyama.com/userfiles/file/86662324884.pdf In PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609800899528d---rajilenigukurexebefexik.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/nizaluxewapev.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27a9e6b0a1---3236983149.pdfIn PDF document text
    • https://goodline.by/userfiles/file/56135473419.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd453c3be8---13785495882.pdfIn PDF document text
    • https://eternalbliss.net/file/84356304482.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/moburorateg.pdfIn PDF document text
    • http://huiking.cn/uploads/file/05190732631.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608768e41a451---defepeja.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/xisatamigulojanumani.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a8219c80e---81916198893.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8vscknihls1ntquv3ubatpmck4/pamagakivajugi.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/95804378270.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/pizurilumutezigurotilus.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b3bccbeae---gonelijedakuvazujutu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a0499d1dd71---rikutefanawetolefurifuw.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/1birqodhpegbtk8q7vom11tr25/49516235504.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3ac54e31e5e6b9ec66e7719f6148ee46/pazarodifutazar.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086150b76976---26797587228.pdfIn PDF document text
    • https://oliogalanis.com/file/botaburalosolef.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/pejeziruterawinowovag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=blue+eyes+with+yellow+in+the+middlePDF 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_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 10604 bytes
SHA-256: a4e2f581ca51c63a717e262fafa4af99aa0c4cb8975241bddb3459d7433b1e0a
font_01_sfnt_off00010d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 16880 bytes
SHA-256: f5f980d543c9ce061ac0154db4a045b770e7d61c296363f18f2602bea8e3d8cc

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