Malicious PDF — malware analysis report

Static analysis result for SHA-256 edabb929b5bfe10d…

MALICIOUS

PDF

135.1 KB Created: 2021-06-18 08:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 515d46b01d8c818202dbf70536c5cc81 SHA-1: 6e57541777d5f16535e4b790ef550378f1e5d056 SHA-256: edabb929b5bfe10d956fa4262d88db424380738337504da218303b9878f7f83a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://medtek.vn/storage/file/texowutit.pdf In PDF document text
    • http://agnieszkapawlik.com/userfiles/file/86825292914.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/77739103660.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/u6n79aleq0701gsf18m813jv35/kuzuleweziwapefuzufo.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1622501580451615345.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/vuniveputudolox.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef1a57aa1---28254003208.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/risisogawoso.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b1026a016---gukafigafizajudoxo.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/94741173459.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703d9cee718---35509354139.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4c48ee795fea34387f50077a9ef5691c/podelaxisovivatono.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/davuporapim.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c255dbeb0f2dd4f3312298a29aa8e19d/gokevurizo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/zasimepoxekupom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=history+of+frankensteinPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C805 4072 bytes
SHA-256: 3af700552a703cdd75261a1abc5d8cc4549d8d4e7ab7da80fba888e4fcd04d0a
font_01_sfnt_off0001d670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D670 4856 bytes
SHA-256: 5da987337d1c4a86700176159f1a1cfee19b5771ffd7affcdcad17a443120b41
font_02_sfnt_off0001e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E70F 12172 bytes
SHA-256: 822c8c42f60f5bcfaefda413b34c002ac7b423bff32c79da077ddf93be542232

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