Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d12aa13d4f0eb9…

MALICIOUS

PDF

98.6 KB Created: 2021-07-18 22:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ce8ed3692a43115654b3ce1c70a00a7 SHA-1: 1fdbb982efeb9d2fddc8e7e876eaacc55f483002 SHA-256: 51d12aa13d4f0eb9a6a2e4f979efff5f4305173d922f0a119d52285bcd0d66c2
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users into downloading further malicious content. The PDF structure itself appears to be a collection of links rather than meaningful document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a302ce35f10---41691053250.pdf In PDF document text
    • http://soflocops.com/clients/67403/File/febes.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dda0a872e---tozaniwepuzezipagitusesun.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d60c376cb8---wuripegobakasepozimoxog.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/12639096962.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17dfbc6637---69576589478.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/97296351044.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/76423638448.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c781eaf0de7---bokagizatero.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106130702394213.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/rfru8c5p62m8p9ood4as8343u3/sulimesi.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/794eb85b19ef31fd6bf44c1d1d2e2019/gofeperapukalufojumufeduw.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607a00c2bac73---wekopavobedoxotisosexi.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bfd0634d6---48926065261.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/58835678645.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b744d4c23ca---kuzomovodajuxez.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b5b8e329---jabujuzasopatisiw.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/8349177530.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/35948670144.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948799e6518---58667188613.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7ca325276---60217374254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=canon+d7+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA5 10000 bytes
SHA-256: 34ac19c5b40a0ddc844be624e24bd440297dec5cce99aaaa1628059e09404940
font_01_sfnt_off000135d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D0 17792 bytes
SHA-256: d681a9d18961de93e394568f51a0a562ed24be896ebf2e76d027914b56a37d2f
font_02_sfnt_off00016421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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