Malicious PDF — malware analysis report

Static analysis result for SHA-256 36257ba2d4592cb3…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 13:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 44b8dccee6c8ef5c3685982f6522108a SHA-1: 12604af186a5ace2d181cf7da3aa8c6219aaf49e SHA-256: 36257ba2d4592cb3e6422d09022deb2740425feed713b1de39fe5addaf41738f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to various external websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=digestive+system+worksheet+middle+school PDF link annotation
    • http://alpanelektrik.com/depo/sayfaresim/file/54576489440.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/26/90702269986.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100b286b394b---82828697099.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/75311978671.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bf3f56f9fb2d42c6ceaac34ee812cb2a/5302194343.pdfIn PDF document text
    • http://ge-mak.com/files/33570656546.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/muradinat.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/41608335094.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/79439141235.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099cd29b2b58---47882056798.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726024e1d06---zezowotuxunidila.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/pugabonefujude.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/de25a8821a44a4fa254b1b47a9fe0b34/15226204447.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d98afcd2---55501994512.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/23438377759.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/julajawajeruled.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6f300a96d4aca5b49710870bc9f055c6/97707782734.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/vukabusojopojomumasezo.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/dujak.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/litegiso.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/wanijifomatemewesom.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA5 17056 bytes
SHA-256: d01d435f3e9fcc024cb37ac8c2a6bf0d54737dc0dbf3526cf36e7d316481fcff
font_01_sfnt_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 10908 bytes
SHA-256: 9f126d568f02cb6ec569158d6a5a3a292a234b99182e122bdf327e47c87475a9
font_02_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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