Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f477b215d55e67d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 21:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f128cee72df70fabbc5aa35dbe2bbeb6 SHA-1: d4307cbaa91c160846a1a9445a609140d86679ef SHA-256: 1f477b215d55e67dd2e436477c5d80b58d7a028f57fe9aa3adc34015e08140f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/35797576686.pdf In PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/64405390331.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090522075873499.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/23655893368.pdfIn PDF document text
    • http://sparkpro.lv/content/file/58799323823.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/21428615954.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/lufulivariviga.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/76aa49ae642624e8815a13fb8ada654f/79571982110.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/83db46b80d052719342b240564d0f1c7/64781385191.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/23184933889.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ebd1821d07a5daae4c382e73ed94d30d/36431196206.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/61036181482.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/jamusepelenejepe.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/44581117501.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210907160829473.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/kisutagosevofaxubezise.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/88408046502.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/87602810588.pdfIn PDF document text
    • http://salespate.com/userfiles/file/85647026611.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/54782021614.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/17162019668.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e50236d57---kiwonejoweko.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/lusix.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/70391085869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chucky+child%27s+play+full+moviePDF 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_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 11020 bytes
SHA-256: 59d1afca82171e9383001b042907fbfb2842e2259c0e2d3c9d24aebcd738519c
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 16832 bytes
SHA-256: bdc4641cd0db8364ea147542639e017367c28d3d9bd9b030dcbcb7850160b510
font_02_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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