Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cde669dfb9ca84…

MALICIOUS

PDF

85.3 KB Created: 2021-08-09 18:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c73230c21fccbf908919373077486e78 SHA-1: d16297ceb60d713c090298b39a48057c10151685 SHA-256: 40cde669dfb9ca84bb3436e1dda9280a1034ecc1606810e58b6332a076a1ba53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of these links indicates an attempt to trick users into downloading further malicious files, likely through a phishing or social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://romanakladatelstvi.cz/userfiles/file/navilekun.pdf In PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d84a9b5087---lorerekogasixurejexif.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/61589279054.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca237e8e3---juvudidu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d09dc16e8---golir.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0152959001622433374.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/d111c9b38616df1fda340061af38a2f9/nutatipiv.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/76208762280.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/wilefuzipexijawetonen.pdfIn PDF document text
    • http://vhktn.at/images/content/files/59367345486.pdfIn PDF document text
    • http://starsunited.at/upload/files/42089612897.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/37745012737.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e8147a0d537---99592819836.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/14488069770.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/4704f0330e489a806bb64b98c85a3df5/wudesolelib.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/4822429899.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/samagusofejasej.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/zujozumigelukurugat.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759396c61eb---79850122568.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/96730982167.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ade11061---borubaturolix.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e8a35d5b.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/75f9c6b01b673555fbc305d231294139/83720977781.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/jobimasuwifetivogozipuzi.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0ae48a006250c6c70e7d53e0c0fa07f6/93784191075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=allied+2016+full+movie+free+downloadPDF 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_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 10944 bytes
SHA-256: 72efd606aa4ace033145b22760d3b46101c3df5549f2627a58ff69cd971e824a
font_01_sfnt_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FC 17920 bytes
SHA-256: c017d99c2a14694b46e76e9d14de8304a6df9a54a65a8061e50596883cdfa583

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