Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b3a0b33c274c23…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 05:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b94fda4b0ffc25398479fc7ffde9b084 SHA-1: 6dfea27cb45840ab756dafd0b0e69ccdf53b46a1 SHA-256: 48b3a0b33c274c233e4bbd18f28cf78e1c09d4fdc6b111404ac542a7369e253f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fa5fa36f8c8---34532932852.pdf In PDF document text
    • http://blpest.com/UserFiles/file/gurozikejugaxonidido.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/25646458480.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3674cee454---11352138412.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/titoluwe.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/ligefag.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7f6408aee---8268418788.pdfIn PDF document text
    • http://poorclarescork.ie/images/43547624732.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/zexadijoperejatuvujogowuv.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/kimalosorisunoned.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/rumafuvo.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/vibogapakalalutudatik.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de6dd124f24---widanususimune.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/vozevev.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/midijusebeperojomasafu.pdfIn PDF document text
    • https://zhansq.cn/upload/file/namupuzib.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/piloduvufenijozizaka.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/79912417922.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/venomoxukulakofu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb0b3ed67---dalidokaxatifunemuxiga.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6bf67e3d1acd6ce52dd053bd9d46e559/99870835204.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8de7158fb---49356227694.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/14886437194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=save+photo+on+iphone+as+pdfPDF 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_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 10588 bytes
SHA-256: 57a2e8a6978a2fa68dfe13266a3a5a97833b363000e7d6814172e3cd2fa2c059
font_01_sfnt_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 18160 bytes
SHA-256: dd88a9ac17bb74ef3b071a291384603301504a12e8829061639accadedceda21
font_02_sfnt_off00011cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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