Malicious PDF — malware analysis report

Static analysis result for SHA-256 48370692b98cfe53…

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 07:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3dddbcbe8bd79a5a6d58eb758c183098 SHA-1: 07ae9430b2303f2b69f31348c08ba1370ad7218d SHA-256: 48370692b98cfe5382a66ce8bb45bae68a29482484fb46585c07d842c91a677e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple external URLs, many hosted on compromised CMS uploads, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous unknown URLs strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160909d50e06a6---somanatejovekedu.pdf In PDF document text
    • https://techson-cctv.com/upload/file/detovosurenizudow.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/77861620114.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/29758507548.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/61491032359.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/2043038011.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///85046186951.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/95d5f823459242981aa54e593627d64b/1455926980.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/21646268598.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/11693176689.pdfIn PDF document text
    • https://airshow-bg.com/file/58074070394.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/gukumafikurur.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/513i5ag1gv1mg9j91pej9uv2g0/31709757810.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/157059643.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160894479b6195---xasadux.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/31745071387.pdfIn PDF document text
    • http://zuche0551.com/upload/file/41712113932.pdfIn PDF document text
    • http://timebymtm.com/upload/files/milafevu.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/37969424492.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67608594d---99487747679.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/rc9v7ks1mjv7r2nrhffpj9h9po/pirekuwomigoduxigemep.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/55364835068.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/70983400112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ode+to+joy+piano+finger+numbersPDF 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_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 11304 bytes
SHA-256: f742b77ad4179b2108454230679124e83f86f52b80b132ec14467de0dabc8853
font_01_sfnt_off0000e3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 17556 bytes
SHA-256: 27724499d89d1d5f8f2ae7b390a771113e9050b8baf1f78985bc2a07c71f1756
font_02_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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