Malicious PDF — malware analysis report

Static analysis result for SHA-256 683e44faa88f5768…

MALICIOUS

PDF

91.4 KB Created: 2021-07-22 07:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b175b096cb1e10c45eed8f8b9649c584 SHA-1: 117c1fd6f746766bbb441621d2513bccc6530ded SHA-256: 683e44faa88f5768aaf5fd0ebaeb24bc0d6e018fa8164c434f4ec39518a5081f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/1e46ut1gmflfms5jg042ck54l1/rivubisetiwivufenefo.pdf In PDF document text
    • http://abc-tel.ru/data/File/kazowagifa.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/effd94ab68b92568aadf4807c11ee48b/pizokulomigurasagaradejel.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/12351371455.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9ecddfa4c---25637856194.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d93cb093da7---porimagagodaze.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/c3b4b99329c4292d940bc7b62b65da93/vaxen.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/2141101256.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/anchm06i2ssdu8jfl1vkskupu6/93647840032.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/aa317339bf7fe60e2a029d57706c2325/fimurulaxipuguk.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/65265373035.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/fegafubeb.pdfIn PDF document text
    • http://wernitznigg.at/files/ninibejamexivuxok.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4fdf18735---ravirufad.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/bomugutil.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ee83292e3---44633292410.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/4388ba50e0007f7ed471fa9a5aca30a2/rezimimalebibula.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/9b3b399ce6ef1c80959287d879a8c54e/14235422840.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/sujinanuzikofojotopepaf.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608528d856267---luzewapi.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/c53d547489a61589aa859b2ff4f044c4/tasazexifumijowosenobij.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e56ed0912---rasut.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d60f51693a4---10443883287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=is+saying+a+bad+word+a+sinPDF 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_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 17648 bytes
SHA-256: d52a28d2e19153425ef4c9f380897b51237d929b5e98d660c72fb2556640704a
font_01_sfnt_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 10440 bytes
SHA-256: efc1353d6893796b285cb0dd4f82a29db34428e150456c7f014bfaebcf624d91
font_02_sfnt_off00014900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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