Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0706a9c5e9d7d3…

MALICIOUS

PDF

86.5 KB Created: 2021-09-15 19:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 137a9d4f565991bff395ee4e34d3fa64 SHA-1: eace98d2d27743ee004b39dae20784d5fd3e3b0d SHA-256: 8f0706a9c5e9d7d3c9bc79682c4ced0e8da9bc9cc8ba566c833d199f97f34b73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated and unreadable, suggesting it's designed to hide its true purpose, which is likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.c-l-r-p.com/admin/ckfinder/userfiles/files/2071133779.pdf In PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318486ec0cc---vufaxuxivanuwugazupapi.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/tonumitezoba.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/089fc00ec291a7ecac27585b7b512938/suwerudewejipalapu.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/kaxowudupig.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/rejal.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161361304ee039---51303905386.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/71554469549.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/13647142782.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/84666528565.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/lumazoguke.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/27418154613.pdfIn PDF document text
    • http://bankerz.in/qpic/files/69216839447.pdfIn PDF document text
    • http://theponghop.com/upload/files/30715144770.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/pojufufuw.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a1cf95e17716dfc5f4d5419b028e6ba3/tigazugidafubiwamikuxaj.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/66844681197.pdfIn PDF document text
    • http://school15-tyumen.ru/f/87807941763.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/lubali.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/84507270485.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/93627709771.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613358d5e1265---wunuriruvebexewizaridal.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aaef8f320---49701272623.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/32043612936.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/lupefivuwavofusif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cheapest+android+phone+below+5000+nairaPDF 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_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 18744 bytes
SHA-256: b4a62f2c6928185f8ddd7e0016d657b0952e6c7b3a84496886f166d88e58344f
font_02_sfnt_off000132af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AF 11000 bytes
SHA-256: 3370f806e36ddb448e582c888c7895cef689729574aa9d93363635c125ffef40

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