Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b50c95edb6690c…

MALICIOUS

PDF

314.3 KB Created: 2021-08-16 21:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5463aa39018ef300c14be918a63ffdf3 SHA-1: 48ddc5c5d0131fbb84f29f74462649db24466fa7 SHA-256: 33b50c95edb6690c591c908147ddc30fd2e25539af18746da3b2e2b199784a04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and links to compromised WordPress uploads, suggesting it is used to redirect users to malicious sites. No scripts were extracted, but the PDF structure and heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8588

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=livro+mentes+interligadas+pdf PDF link annotation
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/d8ba69d3f7881380e3d0f1b23384d5f8/jizotivedanosodava.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/vamopod.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/xoturerev.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c07219d69f---39801311724.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/72098205362.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/jibibodomawuladokep.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/nejodigemewofi.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1626494225.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa7eb50ded---nevolupugebuwodawa.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aabefa4da6a---76484279673.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/90149538057.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1684d09e31af2ce2a141a4bbff1e1a0b/zavapazubaforogitama.pdfIn PDF document text
    • https://susta.vn/userfiles/file/779445877.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9352fd8312---newozubima.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/81030643327.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/semejavosiwuguzozobev.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/30182948853.pdfIn PDF document text
    • http://chengzechem.com/upload/files/31866541130.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/16020908528.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/simanozomaxufedutoberu.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/5521851427.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90c7e5c584---susodafefuxi.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/gelokoton.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00047581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47581 21196 bytes
SHA-256: 9410d4e7656d011b6db4d648f130a9c04a8cfad9985bce53f2421a3f93c743a3
font_01_sfnt_off0004a8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A8DE 10864 bytes
SHA-256: cc48efc408ad2b477d176b89c69e57babf4ca92c563b460a2fd8765186b01349
font_02_sfnt_off0004c1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C1C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1