Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ddae279576deb4…

MALICIOUS

PDF

73.6 KB Created: 2021-09-19 12:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bbb3ab847d6498b94796309f74310b7d SHA-1: e029462ec33fd7e4597eac49addf2104e9958d0b SHA-256: 29ddae279576deb4178dd7302f2e879b39ac8b471abd9f59c75b6953dd5cad80
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting it functions as a link farm. The presence of these links, combined with the PDF structure, indicates an attempt to direct users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://imihwa.com/uploads/image/20210916/files/20210916002227.pdf In PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/xigovoxojasowibowuvebez.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/40925735189.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/39878941477.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090106545373499.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/31648738287.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/lowopisurud.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/domafopadowaser.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/20721724970.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/41952263408.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/muxezanavebemavamugefuva.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/8868770933.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/23961455819.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/fulawumi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f788593046---bedezuvirimizezelaturo.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/70050105969.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/wiwolowosadaw.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/bc859c1521730f2d1469ac8afe419d5f/kakuvebinilawurafuxuzugu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/rktc04j3o37rfgu3eu077vf290/94443580747.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/84210338474.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/10576040057.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6c35b697e4356149a05f990a436a40fa/76744895352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hero+rising+dub+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_off0000b8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD107 10732 bytes
SHA-256: be6e3f1d768d7bc04247f21143598b3d3bed6387eb0926e7f0524882593d4a44
font_02_sfnt_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 18352 bytes
SHA-256: ca0296213143cf40d400781d6f47de9e7366e0a9f2946a8fe361acce0a76aa40