Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0b616f51bbd0d1…

MALICIOUS

PDF

95.0 KB Created: 2021-07-02 17:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 34c21924d1c6775e7a6ca697e05861fe SHA-1: fb8c3a18a9cc203b9e3a1f68674cb617b2ec8403 SHA-256: 8a0b616f51bbd0d13ae0bb46dfe2ca9503010a833424cd334ac37043c221c01f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to direct users to malicious sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607439c4ec3b6---74001628188.pdf In PDF document text
    • http://av-jet.ru/userfiles/file/9134898101.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/24690417598.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/1333640336.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e42c921e4---3023250675.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/92744131103.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ff8aa174e028fafe566e0be898149fb8/42893959546.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/86238903615.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40faf0f8e6---10821829444.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/90014645306.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/kunom.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af814c16dd898df77e4f604e6b9b848d/89566658688.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/72388226833.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/67169639556.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1151c3c725e51913caf6dffd7fab04d3/moluxal.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0e738aeff---bejed.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/86710622334.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58ed9cb046---zesebolokubane.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/j46ben36frbgcn0k3t3srnosba/54663008807.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f4f121d08849026eba887c042432fdb8/sozegolep.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/52504480573.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7d11efc5---20569277718.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/pizepinaxolovajovaxazefab.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d0cfa6108d7a4b84348005740be9243c/widejovasurobezen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=leave+meaning+in+bengaliPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 16692 bytes
SHA-256: fe32a4e3caad29e31098847b0e2c91a8211399848d3e77e584896ec47e26cd85
font_01_sfnt_off00010ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BE 10128 bytes
SHA-256: 6f8f0bc57187138461076ba6bd4a2a0472ae516a24de56b2635456d1dd6764ba
font_03_sfnt_off00013d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D41 18436 bytes
SHA-256: b4e0be7b548ed9b2f03fe9a8e0352d379356bdacbda45a404f565dc024cbd4a3

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