Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e38c593ea148c4…

MALICIOUS

PDF

78.0 KB Created: 2021-07-18 02:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c69a82169c2be262950e63ec021f6af6 SHA-1: 1fd681f43213bf43b111d7f9722aac89e5c1e999 SHA-256: 89e38c593ea148c4199da99db8b3dbbfe0506f0b2fe79bc486b672f96fade501
156 Risk Score

Malware Insights

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

This PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The numerous URLs extracted point to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The file's purpose is to lure users into clicking these links, which likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/fapijojisakipexojogimavan.pdf In PDF document text
    • http://sbnjl.com/userfiles/files/49005000089.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/xibomugew.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/97452473939.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/kaluvebudakokedajotimufax.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bc71abb8c---bobetuwasotap.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/97290386358.pdfIn PDF document text
    • https://argumentua.com/i/file/tifalopewize.pdfIn PDF document text
    • https://eslms.com/userfiles/file/55050261439.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/serilube.pdfIn PDF document text
    • http://debden.org/userfiles/file/weligibolazatez.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/35685037082.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/46370904860.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f80eb67dfa548360cfcdba17c5a45906/burigagavozupupegiparurov.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abca672985d---82003998004.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/29460031070.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/rcdcjdvlfp25q84ssmgdiomcft/tumelixa.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/ld3q47bhle0kks4rb9oh1384fi/sowerurapukadamulum.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/n56ggb5f4na0htu6bio020ghoj/zegoludegabemakowib.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/46079864676.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/io8cs796hfc52l12i9rld1rk37/89177998311.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/12759689739.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/be739ff758833c1fe56c96b6411f1b4b/nuzaromaseru.pdfIn PDF document text
    • https://fototipia.hu/files/files/rusosaz.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/gk7o5eqg87dg54f3ck0oh6gp1q/62704857689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=intel+canada+ices+003+class+b+motherboard+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 11120 bytes
SHA-256: 48384a878f5cf1baa6d1bef68b3d531fe098a657eb7c0b7fd2661e789bc17eb3
font_02_sfnt_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 17116 bytes
SHA-256: ec3297eba51ae18ce25ed2792cf584de0a7e8e2d592555818c7a182be00d7b71
font_03_sfnt_off00012120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12120 1852 bytes
SHA-256: 927fbd6e1fd2ad5d621fbd216861e776272280f09e6c77cd8cfba2e060b93c5e

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