Malicious PDF — malware analysis report

Static analysis result for SHA-256 5183adbaa3ce63ea…

MALICIOUS

PDF

91.5 KB Created: 2021-08-02 09:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd44683ec27a4cc824fb9ff1766ef4d6 SHA-1: c6be54388d3a0d37785bf8bae56d1386239fe646 SHA-256: 5183adbaa3ce63eacee9924f72a99a8e375b9be2f2aa63637fa8bf5a1d087508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://queure.ru/uplcv?utm_term=goljan+rapid+review+pathology+5th+edition PDF link annotation
    • http://shipagents.nl/uploadfiles/file/80215978229.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b114cb88af---5063852842.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f749085993---77782461006.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/84845008576.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d78292a26e---tefuvasa.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/99111333494.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/24492801154.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6i3o3nn6nnql34i3oqhnfjda9/41604058427.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d01ec499b0e---domupup.pdfIn PDF document text
    • http://planbmedia.hu/files/tojavaluduvi.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/0d5fce7d29d4b8482d00ad9114b09142/vulolik.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734d492dc3b---rekuxejos.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tikosadujezuwebamimot.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5eb541af7---22236040967.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/sikegorigenisobeboguli.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105210700.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/puwotumuwunivug.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a3b50623c25f52034d75fc3adcb88738/tojolaxerawunajofo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1246cd18e---pawamarojugeja.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/tasovukitadulivej.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/1fqepad867qcv55ur8tqheege6/moxugopukinotuza.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/57024052375.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/db8d2528ce0863673f5a7d13db0d12b3/degulaju.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/36291347904.pdfIn PDF document text
    • http://mosjob.ru/images/file/56465737191.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/8869375892.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001011d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1011D 23928 bytes
SHA-256: 48492c3f08a3ce2efe0f1603206ab3d329c364f15381a894c3562201d817f84a
font_00_sfnt_off0000d3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E6 17568 bytes
SHA-256: 87ec990c25d24c060f94194cbf710669fa75b17e212d8d79d233d528e44d3098
font_02_sfnt_off00012b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000143ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AC 11072 bytes
SHA-256: ffbb85d93536c767114a8cd38d2e14e92bc81bca726f969872ca56c4f9629eb7

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