Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe674891188cc26…

MALICIOUS

PDF

72.5 KB Created: 2021-06-18 11:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c704a86d231ed31447ef5f1d2dd72ae SHA-1: 7379364f1114ede7b95030036c6542abf10e46a3 SHA-256: dfe674891188cc265a39a149d05039df60c083fe9c6eaf736d0c3a1facdb4fd5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The presence of link farms on disposable hosting and compromised CMS uploads suggests a campaign focused on distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3f9ac4aaa---56104638320.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/hema5neirlnnsb1iq83efmnbt7/58962979885.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af4db66e7eb---mizox.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1gf5jbu7au866e8v8e0ud004a7/joguditebufoxi.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71ab1d2bd---mitovupag.pdf
    • http://jarosi.hu/files/file/wawajoli.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa7cc43617---jurupefajiwujizizaziwo.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071c34011963---tarusadivizikufatavul.pdf
    • http://salkim.com/userfiles/file/midodaliko.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/b4bjog4to145uhqqcjs2qomha1/xoguxakataxiralodarafag.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e546d681---bafaleluna.pdf
    • http://biswasi.com/userfiles/files/tujuzoralutejalixazojegem.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/2fdae4818fbc53439b61d417b93e005e/40075603462.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb45f1051---45793765976.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ccb3da1db---zefenenuvebot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=study+the+word+to+show+thyself+approved
    • 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_off0000e0d5.bin
b45dedc5d4950081cdd4f0fc114889cba2c8cfb4f0b4b627fa4cd1d784e6269c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 5484 bytes
font_01_sfnt_off0000f392.bin
5707efe0f0e5ed78fc15e61531f943c934a4829d260fc56fc4f667fbb1a38390		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 9736 bytes

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