Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d86bf23a7400d2…

MALICIOUS

PDF

73.0 KB Created: 2021-09-28 11:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc0e78fa245e66e544d5122dd82b1fd0 SHA-1: 08615bfc8baef9656a1300da3bff5d6e5b17a7da SHA-256: 96d86bf23a7400d2e4b26c38fa7a0bad8b2ec4286e39741a54065cfebb06aedd
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of a QR code lure further suggests an attempt to trick users into visiting potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://svarovanijelinek.cz/ckfinder/userfiles/files/43460871502.pdf
    • https://lanjutpt1.com/contents/files/tukuvagesemefuzaw.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/9918ed0c8f9f4ecfc2ebc3b979382cc7/29210676591.pdf
    • https://takipcisec.com/calisma2/files/uploads/piviwogenesopas.pdf
    • http://aokunoil.com/ckfinder/userfiles/files/lelubujowipiramarivud.pdf
    • http://www.museopizarra.com/ckfinder/userfiles/files/kojusavopuxazasufokosi.pdf
    • https://leifs-auto.dk/images/file/jozarexigaruli.pdf
    • https://12shio3.com/contents/files/lowajedonoberaz.pdf
    • http://birizgardenhotel.com/userfiles/file/97057698989.pdf
    • https://poolpoint.be/uploads/file/lugisuratidazeboj.pdf
    • http://ptairsupply.com/userfiles/file/xuzodetaxavupusurokibo.pdf
    • http://aokisuper.com/ckfinder/userfiles/files/pipifijagirejil.pdf
    • http://www.bluefashion.cz/ckfinder/userfiles/files/85146129311.pdf
    • http://geometrabottero.it/userfiles/files/kikodememazeze.pdf
    • https://soswzgierz.pl/web/uploads/files/47455091731.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd774d17f---42226184432.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b16fcd74c6---11416545742.pdf
    • http://zhouzhuanx.com/v15/Upload/file/20219244446852.pdf
    • http://misosmile.com/upload/editor/files/15722294397.pdf
    • http://inlovehuahin.com/file_media/file_image/file/rugasorelapa.pdf
    • http://egitara.com/upfiles/files/50624327839.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16150fc485a7bb---sedipolugutedugewusoni.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=family+guy+bird+is+the+word+gif
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3b1.bin
d237bb351a5ae6b00839497d81d39b1874aabec6975a6a8e49a024eba08eb4bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B1 18580 bytes
font_01_sfnt_off0000e30d.bin
dde7373f4c4c2e32df7009f79f0402aedf201b3a3ea78405610f1a6e41d5baab
pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 11116 bytes
font_02_sfnt_off0000fcd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 16792 bytes