Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f01e08b35570fc0…

MALICIOUS

PDF

76.1 KB Created: 2021-09-06 09:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04c480549585f57107d17cf3806d3471 SHA-1: 0d01f6a246ba46d44938a1e95c9055aabb730d2c SHA-256: 1f01e08b35570fc0ff281ae58d1c8f79f3e146071e9ecfa5d2c4671100fd0bcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. This suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://albertopizzetti.it/userfiles/files/3831476437.pdf In PDF document text
    • http://kd-council.com/upfile/files/risevubifodisawutojuki.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/cbf2a8614d6167817fba79f9067c0273/28271043238.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/0e9d38972948660334c2bcc4ce3881ed/53313246341.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/17e4ae1193fff6cfa97e8a43d0b34236/bekevorokepiboriwikovo.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b99a495e3c5---lelizosivej.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/brtqu7tfudrjdv833eiqk79hfn/zipaxujetokuwiwaxo.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/juzotofup.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/sodulifowixoxonarusupadod.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/mogixiworubetoxulekere.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/kabowolifu.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/zezawezomexokevawix.pdfIn PDF document text
    • http://mesterek.net/tmp/30203493501.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/tumavexud.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/sagoli.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/27266360511.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7397161817---82829090283.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/zerobavelunakekutudure.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/47715451085.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/pcsaml4qb9gfchhspeu5unrdh8/pomumomadoguz.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/42859283107.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/repotovomeguse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=estat%C3%ADstica+b%C3%A1sica+pdf+morettinPDF 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_off0000c0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 18756 bytes
SHA-256: 9a62784b22657fb908433b5b3c5b5daa81b86e7e960ba7f05b47e8fc8b5f5764
font_02_sfnt_off000107f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 11100 bytes
SHA-256: 0825fd8856300bd8db287ca206e2f8aa9b7458b21374f6c8704187de1419ebe8

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