Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f9fe64409a929d…

MALICIOUS

PDF

73.7 KB Created: 2021-09-02 07:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c795cbf8aec9b6f178d2ce8a74706609 SHA-1: c9ec1d6fda08fed652ed6073c2756d76d74b74b0 SHA-256: c1f9fe64409a929df0c88a68ca6d8ac99fdc7c861f9d939f49fa757aa41b46d7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress uploads and other disposable hosting domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the presence of numerous suspicious URLs strongly indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://3e-machinery.ru/app/webroot/filesfiles/54287125318.pdf In PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/dotopemaze.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/18134227674.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/wikavukedej.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7k0c8lcgeoju88moc1ctm58hu2/85336860332.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/18961029028.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/zojopowerigopiruferimotoj.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3f02942f0f550686e0eacc8d03f93b7c/petemaxafafaxexivis.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/69786413200.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/48254665590.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070459fe1685---72484047310.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/3c8fb37a6318be728931aaa2c7bd8006/77875006283.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/92995830680.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/49096482816.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/bifilolonawox.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/46897306891.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607662f4d93b7---vifiwezixutekisoxexaxe.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/4340747275.pdfIn PDF document text
    • http://mientrungpetrohotel.com/users/files/pizuvufuraxenifuxuvumija.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/69084195937.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/609e3947d43599ab5b34af68d797bb48/94567057472.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/4b9abe5ad413475e04b6c12b6a45b697/gerilaxosi.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/wurezosurijomemop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cursive+writing+a+to+z+tracingPDF 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_off0000bc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD447 16764 bytes
SHA-256: 029825b8362f24989e9151a358b3811647a898094c4a0aab79f9997bd02f6891
font_02_sfnt_off0000ffb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 10700 bytes
SHA-256: 10a1fb76e27720ebe232b429b208f909d9e67143690139accbf82f6c345c6229

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