Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c69c1f169d342dc…

MALICIOUS

PDF

83.1 KB Created: 2021-08-15 20:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5d2028075767a71aa08a7dffe6e077a SHA-1: 4499f3121f9a438da7b1a9fbaad6b5d59f9e08f9 SHA-256: 6c69c1f169d342dc160ad7b021c44743be595eae533a66877d932c86b95ed386
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS uploads. The presence of these links suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://rubivina.com/Images_upload/files/sekegudisa.pdf
    • http://zartmobilia.com/userfiles/file/20210603034123.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/97068519908.pdf
    • https://kingcarmotorista.net/uploads/files/gomulevi.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf2a50df7---tinex.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/563b6da0a399130d84da1360ec1da1b9/85551583987.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0bc3db90bb---wisipopekuruposedane.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8c8a94899af9082bbb0184647652a7a6/89735442543.pdf
    • http://utuin.net/files/fckeditor/file/wozimajukazuwabasipitode.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8556e08d---zujutiw.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1d5b755e0---lomuf.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/752b57114b105dc19d188bbedf584259/77178559381.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/129ab09daccd93da90f779d0471e7075/38947853578.pdf
    • http://yizhu580.com/ckfinder/userfiles/files/57157248033.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075641b5b96a---88434831563.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/butapejawapuvo.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965ec9d4ebe---pikataleses.pdf
    • http://guanzhuli.com/userfiles/file/48427650649.pdf
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/20776709897.pdf
    • https://samsunyapi.com/userfiles/files/55683227245.pdf
    • http://royalleasingny.com/admin/images/file/pavowevunibazusuzegup.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087556d482c7---87640205721.pdf
    • http://stardentalcare.org/userfiles/file/digino.pdf
    • http://primaneighbors.com/userimages/dinedurivigobudulofevu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+a+12v+dc+to+220v+ac+inverter+at+home+in+easy+steps
    • 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_off0000de87.bin
cd721486e6b71e6bf58bc5139673e5b18c5c1af266af97c7a98da7138fb34b6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 16344 bytes
font_01_sfnt_off00010884.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 16792 bytes
font_02_sfnt_off0001209b.bin
cfcbb498c0121af3f45a76f2bba6cc31db64012c390b705b29de53ba5eddce0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 11376 bytes