Malicious PDF — malware analysis report

Static analysis result for SHA-256 04537e7b46f9d3ea…

MALICIOUS

PDF

100.0 KB Created: 2021-07-03 10:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fbe219f1d6d79207686bc203cdbf3069 SHA-1: f3eeffcd78303d4a80fc2ce25c52cf1d0a065d4b SHA-256: 04537e7b46f9d3eaa652380797ffe1907a08b1189df3fc2d7a4bba09801c3082
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to direct users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08d1cb8492---zononafodanorotidok.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/24843da37564fcf43acbac1d6fd0fd9f/lamurufeze.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/95052626335.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/valuxogonilevixanewaletux.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094592b9058f---pibumuwi.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160929a6e10744---11837476615.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/4318678177.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/tevusenolufabekujijon.pdfIn PDF document text
    • http://cga82.com/admin/File/11019534463.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608018ac0c01a---75099229081.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9ed9f90250600ff86fc9604275d0e263/woritibelako.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607613885f10d---47999261547.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738009b74be---68068189577.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a918fdd799c---60309123573.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda9c47e61---tuwologilajubali.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/g7jdil2mfhuh753a52kkragql5/nodugekigovirebudif.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/mogedozemoki.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27d8f3d84e---fegajafakixoturago.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/nasipa.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607544f7d96d4---47854115230.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/nalosorazoterog.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160844ded41249---19364246379.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/115f9a990e70cf5c36161ae16cd119bd/50527270022.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/b5b0de968b83df5cc3c995202be58240/25116888767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cannibalism+ielts+reading+answersPDF 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_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 10728 bytes
SHA-256: 22040d9f987d214bedbb74b5fa2bedb494726d34a5d84f8ec2932033e544b510
font_01_sfnt_off00013d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D72 17408 bytes
SHA-256: dd4832bc8e7c100eacb13de61540b1a49c3105021c59d33eb37f56456101e06d
font_02_sfnt_off00016a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1