Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d66fde63b173f3…

MALICIOUS

PDF

94.3 KB Created: 2021-07-16 21:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30cfe512d09a7d5119a6a6469f95e311 SHA-1: d1393ac3b463d722f7a64d5518032a2501008f93 SHA-256: 28d66fde63b173f3007500b4a6e1d35e8f4470b8c718e0e71932072b5275651c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to compromised CMS upload storage, suggesting it's part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'SE_DOWNLOAD_BUTTON' indicate a lure to download a payload, likely via JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7315d5f6---notopakugilutekasefe.pdf In PDF document text
    • https://edusfera.pl/upload/file/lukelawebiped.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c149b840d0---55643011311.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/36282122087.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3a32b7c1---98572433365.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7bab4ed567bff07732bc5a7334ab920b/50741542581.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/949c1d690a442e63f504086f4e9da2b2/dixowonamuwabanepenopu.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/n1q8md8oamv35d732a89ekn4vk/bomijapejuzu.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/ac5c5651e5c6393423ab71404b9b2de0/38944144033.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1ec4a8b96---35340673609.pdfIn PDF document text
    • https://actor-conseil.com/files/file/22082346194.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/83974736945.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16097259314b5f---besorujanam.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/81445810805.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff0417b7dc92f9c2df3f727bf48041a5/denetidipabisi.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/wuwenemumedukivebikudum.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ec41a67b37743d13724d1638f4db7fc2/pizutatofanopuzevek.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071457664dee---sijenasutagureni.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e239a9f67---jivuruzilazudijira.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/47762032128.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/dcbaf56dda8c67a583af448355aca7a4/53406864002.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/64486524899.pdfIn PDF document text
    • http://meta-min.com/files/50666600088.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160878e4a3b658---79783617108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fortnite+free+aimbot+downloadPDF 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_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 16076 bytes
SHA-256: a788292cca142aeed5da50f6fe930e2a2735a94866157f12b187defed158ae4b
font_01_sfnt_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 17708 bytes
SHA-256: b7c64b1834caf6a8a9a4e5192a1ce5dea63e337d6f27e95ccb66d31d61f6ca71
font_02_sfnt_off000139b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B4 10552 bytes
SHA-256: 07b1fe1113a74c6565c38df72f77dbe0a98999d332859814644c849419503030
font_03_sfnt_off000151c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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