Malicious PDF — malware analysis report

Static analysis result for SHA-256 9420f3e09846cdd4…

MALICIOUS

PDF

84.8 KB Created: 2021-06-29 09:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 233c45bfc9b6096d06aa64d9be91c090 SHA-1: 9798ee811bbf36730199ed33dd825ad0376715ae SHA-256: 9420f3e09846cdd43cec98e257b97773d90d6b3bb3c425311e2e00b519696acc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=food+for+thought+lunch+menu
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/2vjqv9r8nicetofqnb3vs4e470/redid.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39adb21762---nopasusanejijosutuza.pdf
    • http://b-solutions.net/userfiles/file/74617599134.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072e4545fc45---37754003089.pdf
    • http://guides2alpes.fr/uploads/file/98762652822.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e6d2676572df9769d09f0285ae163602/57273187756.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/memaberadufafonuvakejit.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b085a17c94e---xawuxenedoxatawolevixomaf.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/199801545260c78a01b175f.pdf
    • http://vogiantinhmach.com/media/ftp/file/89268773221.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/52083925022.pdf
    • http://yuhenganquan.com/userfiles/file/20210531170329_1689159948.pdf
    • http://cc-loges.com/uploads/file/712643076.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f084e51abb---49742948432.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3360f6c9---68555770909.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080932feb940---45686805598.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7391b0c8ae3c8784e0e1477ea8d908aa/mitosowafofikujaduxevaw.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb052b438d---58999274283.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///2021062174912_1040137315.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088712c05efe---19491470596.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fcd70663b---60756658191.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/4518e88754d82dd278ad21b3ed6a8ed0/46069818583.pdf
    • 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_off0000e9fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 16792 bytes
font_01_sfnt_off0001020c.bin
9b3d6ede4ae2c143cdc28bc3f4cdd9e0e4ccb86eb7c819d6becb1ac4668fb246
pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 17012 bytes
font_02_sfnt_off00012e87.bin
56fe535e4253718139e8836ae2c113efc2e35614e400c1755f35a27034b49284
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E87 10580 bytes