Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd5c244ee1ca406…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 08:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2be284c6a91407b0ea1709ab930429d9 SHA-1: 1e3970a88f4a6b5b6814b3fa013f5cce31f2c3fa SHA-256: afd5c244ee1ca4064f4cf5ddaccc3b12ca8e93f1f8ad7909a215aaf6ff2a9cb4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The document contains an embedded JavaScript stream and numerous links pointing to compromised WordPress sites, likely serving as a lure to download further malicious content. The presence of a link farm on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/17d0245c8a27d7f806782dad7ebe5054/wegatagatisasulos.pdf In PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/40a9b65a406aa7595f3f1b600f264ae5/80483354213.pdfIn PDF document text
    • http://kclandscapes.com/ckfinder/triplebuserfiles/file/31662148854.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607121159b326---69354672985.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4da3feb6d0---rozepofaxixuvotabe.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/bufaje.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/87233470774.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/67179449326.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613408907861f---31711689826.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/35782440134.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/biwigonatasi.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/24263651346.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/lirobuwojaja.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607685acb3371---83411378916.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/818d741f325b29de2cc8fff1fc9aee7e/lafadego.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/feloripijurutitovela.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126859cb77c8---dinodeda.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/tudub.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/999c525c464c028bc509fdab0e63c929/22204620823.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/58428488628.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/jivokamawevuwivedeneve.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edb9b78efa---wukavazelemumuwenezi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f0b77ccb8---56961711998.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/sebizobexixefezilalusugi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/33507696560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=convertir+rpt+a+pdf+online+gratisPDF 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_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 18600 bytes
SHA-256: bd9f8690b5284b7efbfad38a84d499fd2e8a8db06923f93a0069f2ce0b6a2793
font_01_sfnt_off00010b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 10768 bytes
SHA-256: 7cf7686c5cd20ecc66b17be8415fc9b95e851f253c018f002f7d2704cd655395