Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec67d07087b2deb1…

MALICIOUS

PDF

72.2 KB Created: 2021-07-23 00:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 651fd6c08cd1c2a39727cfc6f40badd1 SHA-1: 9a38ab19ae7b57a7198693b23cd3534465297de3 SHA-256: ec67d07087b2deb1b59232629027fc5adeb14dbdb37b87a5912253dcb0f468da
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters further support the link farm and potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58bc0defd6f4558f29a17606337c18dd/10777259649.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4b99a702---nadudetuvuginifi.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092c81f9773e---34685653269.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf96b1d8fc---dedivabixutina.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7803e3512db2833cd9aaec2311e654b7/guwuwemisexiget.pdf
    • http://savitaco.com/uploads/images/files/kajibafidovitomuta.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/zasuga.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vm7qlhvh3d92hbhc87j2v1no03/46658320442.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb8458682---bivod.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7cbe8e4c6998ca8b88abb6bda39d359f/81597189926.pdf
    • http://harryreichert.de/uploaded_pics/News/file/28040613944.pdf
    • http://saatgaamkansarasamaj.com/admin/uploads/files/334660954.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/77892821399.pdf
    • https://aprilboya.com/userfiles/file/76653372282.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/aba0e118fab2396dbbfed5d0295f5e27/16853628677.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d7d76f156---45206814771.pdf
    • https://anmoul.com/userfiles/file/badanakavunemosaluzelaxel.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba98eba64f---39196382234.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608083a222c8c---24876812748.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609170f06e456---37674063026.pdf
    • http://terezmisszio.eu/files/file/fimelujuparowinifufel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=chill+thrill+meaning
    • 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_off0000bb61.bin
9180ffd0c1ca2d86a1a89d003b8e8eaea2dccc1035f6f6974ff53a17bbe9c224
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB61 10296 bytes
font_01_sfnt_off0000d259.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD259 16792 bytes
font_02_sfnt_off0000ea6b.bin
2fcf335babcc856d682a48fe9b696271d72c668f8a95444f700b5f43657d93d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 15880 bytes