Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ea52b270b6de3c…

MALICIOUS

PDF

91.2 KB Created: 2021-08-28 17:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33ed08447fdee6ea41b2e4fb0070d980 SHA-1: 73f39f806db639117099e7aac89abbe0cf92f1b3 SHA-256: f9ea52b270b6de3c309c43818fedfd3703727034b26abaaa528c87d187bd685c
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to phishing pages or download further malware. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://agro-pasz.pl/ckfinder/userfiles/files/fufol.pdf In PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/mabasof.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b56e0fc58e7c61ec388469bfa8ad81b6/16596482747.pdfIn PDF document text
    • http://jsdarvin.com/files/resugodolewijogarokalejox.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/kasoj.pdfIn PDF document text
    • http://taociren.com/upload/file/210820132937750002bfbezhhkrhla.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/48126554221.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/2309836267.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d56d83082---37837973265.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/82184564043.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/13962026711.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160878bd53d09b---54213352706.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/52cb1ea0ff2f0d9dd4f17a8c4ec2ca69/6029125536.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/givufebevubaxupanenaro.pdfIn PDF document text
    • http://amdind.com/userfiles/file/68433313651.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127825bb0e44---60110829426.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fosamuwutudug.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607769af07bca---75051852088.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9af7b93bbbe25e0497abe32b603a701a/25170274258.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad2c49ea18---levilutu.pdfIn PDF document text
    • http://signauction.net/userfiles/file/89172014940.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeb74056c8---14080829727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=11.1+the+science+of+ecology+answer+keyPDF 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_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 10928 bytes
SHA-256: e6a4449cfdb68b1dfa7ad2c39772c28587fdcb9dd48445343e167f5aed091b27
font_01_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 17820 bytes
SHA-256: 9d8ff11ba6baef28cc7282ee5635fe2724a289d588b8108dd479e48f90c2ab05
font_02_sfnt_off000146b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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