Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a5c7206d72e57d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-23 15:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b67f15d1211fd80b726564b4ba0ce880 SHA-1: e02094c68a00e7d93dc71441365ad647fdae975f SHA-256: b3a5c7206d72e57d73f0cc76680eca1937d582232e89f51b98419f3d02ef0eb3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614708f3a859c---2819463524.pdf In PDF document text
    • http://mywymc.com/userfiles/file/85669954395.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/27303951648.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/winizejoxut.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210910_013224.pdfIn PDF document text
    • https://migger.dk/userimages/file/1043160280.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/54184732477.pdfIn PDF document text
    • https://ibericadearmerias.com/file/9857035704.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f2a450de4f5450b2b235b3f81bacf320/mupopezib.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/bijimow.pdfIn PDF document text
    • http://aven.su/userfiles/file/timezilonolabemek.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/loxukaramupe.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/donitumujejetisez.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/561af2ad7b3c8ddddf0760f4161c53d3/22189390269.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/92741886544.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2b5ed341fde803f627936b0db9e9ae62/dugejopexis.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/wisosedaliv.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/jimogu.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/45766786154.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130377c0f0b9---poxasosum.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/65355850254.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/49731590643.pdfIn PDF document text
    • https://unaizahic.com/Files/files/gitami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sniper+3d+mod+game+downloadPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/lezepevidogaporotojofekek.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_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 10804 bytes
SHA-256: 524d32d96b6e71cd79d95743764321f5dc812c1162638823bffb623b3b2a8cd7
font_01_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 18556 bytes
SHA-256: 9b0c3c76f5ab20a4438fa7faed1dec73ae85100349f8a44245f4991f6112a883
font_02_sfnt_off0001312b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1