Malicious PDF — malware analysis report

Static analysis result for SHA-256 3633b5a6d20d7881…

MALICIOUS

PDF

84.1 KB Created: 2021-08-30 15:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 508ee9efd5274bb4c5c20ee5cc99cb63 SHA-1: 44ac8593091c3f96b98f93b9ea28cb7e441d8b14 SHA-256: 3633b5a6d20d7881a27deeb96c2fff4430ee45efef52f008e00db4500d634326
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 links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm nature strongly indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/2klcenefap9anm301hf5jmbo50/bexoxajojogoj.pdf In PDF document text
    • https://actor-conseil.com/files/file/25458116810.pdfIn PDF document text
    • http://jarosi.hu/files/file/57008604238.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/91702145205.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/7ej6m168r0j9aupb6nvb622i9e/migolesesabifujifuzarofog.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/2eta9hn7fqmgmppptniea1tbud/tazobusivolexalusojolefe.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160baff733b453---66526583239.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/anl4bqpiedh76s25ngf8ljeapu/54992602169.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dcd3e305e---79900068269.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/824fe6d5518884c91a0f1e5c514f3aa9/53985785870.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/14759360422.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/kujefewuverazepani.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/744d7a7f112106453d05bb6417bafadf/80116931467.pdfIn PDF document text
    • http://ubest.ru/images/file/zitadewasitev.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/42059485276.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d317d0c90e---46386123780.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/13261679828.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/gogaguzagor.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/98284973090.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/kezotimemimepope.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/46550931390.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/fufidatezavirunugogor.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/7770cafdbdf19d1a7bf13496c3e5b650/rapaziburo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf93b22dcce---butorani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=civil+engineering+interview+questions+and+answers+for+freshersPDF 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_off0000e2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C2 17452 bytes
SHA-256: b163ea0ac1da2e5419fe1633571b2fa2e70c03e27b29b72b31dd2941637338cf
font_01_sfnt_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 11064 bytes
SHA-256: f75550e91ea6e6bb2319b7727e455cb71d82811cd57703fa22efc514aa2aa0bb
font_02_sfnt_off00012927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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