Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56d1cedfd070cda…

MALICIOUS

PDF

69.3 KB Created: 2021-09-01 04:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9191ddc545f0eb22f11670e6f87e5f11 SHA-1: b69689be8b0b01d958a17ad2afdfeb811f074a40 SHA-256: e56d1cedfd070cdaac94bcea08194547d4f75cee95ab4523750a2b8898097676
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://huntic.ru/uplcv?utm_term=persimmon+soft+kind PDF link annotation
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b71cb1648---97964664375.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/22557508952.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/65654007605.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/laxefuwexekuluwija.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/83508102332.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/404c9f251e59142c880dab9d04c78743/fezosetasi.pdfIn PDF document text
    • https://dm288.rs/slicice/file/37708933179.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a46913b528e---43337063035.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/12346489068.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/26272775016.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/gufiwiditixune.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/7m5j1mh4nkohuf5drh7bck9eaf/90453940584.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/69234773142.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611324417fd52---53167872966.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/xisasexefisexubamil.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/81219821150.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad8549a77---paxadigimuvowedu.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/novune.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/palekiweniloto.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b317a01de48---pulafemo.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/24985119131.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/sopilizewumewukuded.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1c280016201899923a2c62430881dc03/ketatodekop.pdfIn PDF document text
    • 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_off0000b33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33B 10400 bytes
SHA-256: 83fb06afd7e4c74c99abb1a9dee04eaa1163255e763c65749e4643b6a698e2f1
font_01_sfnt_off0000cac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC8 14300 bytes
SHA-256: 63d24d3ef30fff868a76e293c45c4551268dd8b514f73010938c3bd274d8c7e9
font_02_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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