Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d6139e7e6e348c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 23:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0c25c3ce8e2d09b7b1039148adccc33 SHA-1: fedefc9463214cef9589ab202ac2dc7e763b9561 SHA-256: f1d6139e7e6e348cea3004785281b5ea8949a6a67d2a6a17f8b8db87b1612da9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves luring users through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://krisoc.ru/uplcv?utm_term=ectopic+definition+medical PDF link annotation
    • http://www.neoneofitou.com/ckfinder/userfiles/files/5642451826.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c192882e4f8---72007527743.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/40639154865.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/xedusixexi.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/79785016482.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612aafe46e590---75953431660.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/tubefuluwej.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/texemufurexawonebupexoba.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3832f40e5445c036c3fd1c0b6085d45e/29936453775.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072daef967b4---tagogax.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/fotelenovedavakoxotibazuf.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/99517356945.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/mflos8mic4n8i9b7ois4blvo6g/rabonitozaromi.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/sonuvikojabazozu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607beea3628a7---newumizojufosufuwopor.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/31b85bb306e0477305f8a99ce235bccc/84067469782.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/60620628676.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2debc90b---56479767863.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f7777b9350---menogo.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/fbf9q9jg44r6tnjd010bsuhdca/21070493760.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073dbaa550ea---7160561602.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/rfu5l3f83miv59vth5347ibhl4/30213720799.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/s3vusplc5s8v40kkcqq5p70fje/pegowedukusafosuxum.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/96023840587.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/cb55e308b13c5605c9623c97ecf52e31/moxosajesabunelavetogid.pdfIn PDF document text
    • 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_off0000e644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 10496 bytes
SHA-256: 9bf7a54671a4dbe8f84e70d62dcc432b003dd76879a472de247522353c932609
font_02_sfnt_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 18228 bytes
SHA-256: 8f90b421112f4a19899124460c9d0199a991273f92cd80318efdd6729d0d64a3

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