Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff585b1feb81013…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 10:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f4d7a269ca062ca851b56df5e4cbfb9 SHA-1: 2da472e80611667df9892d78a9c6a0836a7087b7 SHA-256: 8ff585b1feb81013e4173cfcdc153d89eca4c48bb63f805cccd2450a224ce7f0
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 an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The primary function appears to be redirecting users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/uplcv?utm_term=chicken+balls+and+sweet+and+sour+sauce PDF link annotation
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/34207265046.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4a8bef854990f5f4bdf6e0ab23dbcac0/fimosevozole.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/49282509357.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/lupabutofa.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/91056035310.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/45661418839.pdfIn PDF document text
    • https://bataretak.com/img/files/file/xevewazegipidemalekedikep.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca73cab2e---17804531682.pdfIn PDF document text
    • http://blatt-gruen.ch/files/nasilagurax.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f03472d888---39060010431.pdfIn PDF document text
    • https://filetorme.com/upload/files/jamilanutamup.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lhm6ojk8q906k7dkhn5uqenc8g/bozasa.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c969fba6e49---nazikedemoguxomigotoxojum.pdfIn PDF document text
    • https://horticulturenepal.org/userfiles/file/ramabajuvixelewete.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/meguzoxevodosovuwimosular.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/39b3ee69bbad5a03c633b4c5c03fb127/53905596809.pdfIn PDF document text
    • http://kesifveotesi.com/files/wavabazopaxuxusipumagi.pdfIn PDF document text
    • http://ibb-online.ru/f/file/lamivuvumajexalum.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/jf5v20oeh5i5hk7ts3sp3fkl7l/31415944622.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3030c426ec2a50da5b7e6955fc289826/75094066061.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/lusatugazudifemeropezi.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_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 17912 bytes
SHA-256: 51615d09a9ebd43778a97bb635f04e988ca57e03f93d0d77a2aba29870b98a4f
font_01_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001282d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282D 10916 bytes
SHA-256: 9dd7845a49881570c09997b40d0f6bcc34dad76286636f2306515bdc32195c6c

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