Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47d7d377acd5a5e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-21 14:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4506d0833620cd594f76583dab87b916 SHA-1: 2f0701705814354a962e1125614cc885a33f3546 SHA-256: a47d7d377acd5a5ed31e41ac109983797a83f433495b5bd66cd956c6bcf285e4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting further supports a malicious purpose, likely for distributing malware or facilitating phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://foodexgida.com/uploads/files/77174037710.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146ed30398---64136048855.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134428e0ec04---92362752800.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/81012299797.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/92603339529.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/8874743861.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/resoferexit.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/96671612678.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/vexejonifupewuxexab.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/26714156717.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/furegifesowofefo.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/negadutilizisuguwo.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/15550337405.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/26751856403.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/vn6ulfbuo1s2v8e4044jllrgm6/39706209169.pdfIn PDF document text
    • http://bluebossa.pl/files/file/76610459517.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/28340661574.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/36000027479.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c41be8621a1ba092a3d4fd9d9295cff3/11344087766.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/mevizuzuninilen.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/rufagupobe.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5349a93cc595361c2baf64693cd45d79/foridunosaxexak.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613894f0d5d09---74446910357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=drum+set+app+download+for+pcPDF 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_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 10876 bytes
SHA-256: 26f9c787899823a84d451fccd47e0d855d734ab61873dda06d6c9ed296c8a552
font_01_sfnt_off0000f8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 18484 bytes
SHA-256: 194865e1b4eb1e5d4302d573861f8270279ef3e978ef630124387fb4bab44921
font_02_sfnt_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1