Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0a4b00c1ddc9d4…

MALICIOUS

PDF

92.5 KB Created: 2021-07-22 23:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab8bb557e3e21fa91623fec1d70bc00a SHA-1: d8142f94e00b6c12d0857e4f16f87a8b5afa5da6 SHA-256: 9c0a4b00c1ddc9d47aa6a03f362df429eae2d32bfceeb7028166dbb36a69c361
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely used for SEO poisoning or to direct users to malicious content. No scripts were extracted, but the primary attack pattern involves luring users to external, potentially compromised, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7a832d21---mudosol.pdf In PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/jibanoxudemufapoxegika.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/46105254490.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5027078331b606bb42175eb242ff7b90/kasoso.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/73ad505b53c11b3ae6a613d93a78ced2/263427504.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/1d9c6ffe69e1760f308e828cdb8844e7/45157056005.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e215fadfa3---59405449540.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f43a8624e1---razoteluruni.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6c6349e18fa591201216dc0657cfb9db/58619492956.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e9d94b1e3---waronubamupod.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863465beae6---lugokosavuxisobud.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/78457146792.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/46e392187cb8e78fe4913f15d58001ec/nuwogijugojibejomedipoxa.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/nsv85g5jlt798m8igcbc7i5koi/nivew.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/73836060021.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2b645ed1ffa48ddf2371dcc1009d3f41/53121985011.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/gigopuzulusi.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/b1c725e66aa9a816067b51e392a6e202/tevaravoxavubizufuziko.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/41458686104.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/vakobiv.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/72248803452.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/85628196389.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1ce0935b---lusivimozolire.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/94387878940.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/08f2293b03a00ec621e034950c115d6e/safesagulupefaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sanjay+please+pickup+the+phonePDF 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_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 10884 bytes
SHA-256: 2cd808911bbd6fbad697015be59f977c66ecea26810202b0ce8423474c5b41ef
font_02_sfnt_off000139a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A4 16312 bytes
SHA-256: 3ae83666847debeddc1f3e80d6b2df8b8ade1ce36119341c403d431c8544d4c4

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