Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcb399fde999620…

MALICIOUS

PDF

85.0 KB Created: 2021-06-28 23:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28bbcef35d3591a2c3eaa26a6fc08a3f SHA-1: 084fc2acd005e2b09fc7e643cf26697d96b616e1 SHA-256: 8fcb399fde99962093c41ef543b7d0e9ef93c89f96f31c645a74a0296000444b
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, containing numerous URLs pointing to various websites, including those hosted on compromised WordPress uploads. The presence of these links suggests an attempt to lure users to phishing or malware-hosting sites, aligning with the Spearphishing Attachment technique. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=how+to+make+nametag+in+minecraft
    • https://cleaner.pl/userfiles/file/kinakovomeses.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfa656fe90---ruluzejosopodapigimifobu.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/lu5lkfknvqdbjjhf9vd5ad2va3/27878029286.pdf
    • http://fszhenjia.com/upfolder/e/files/20210614041411.pdf
    • http://airconbank.com/upload/fckeditor/file/dusatokebolo.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/bugitime.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a50e7b2bf6---sapilipujerugojidej.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983fb2523f2---66276736535.pdf
    • https://avigailpekelman.com/sites/default/files/file/21546193463.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4fe202727dd4c0a24a1e460ed115a052/powebupelixebikat.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9ciptasup9mg6hrol63gjo5emi/xutuxaxowo.pdf
    • http://24cvety.ru/upload/files/29308461363.pdf
    • http://minhvuongthuphap.com/upload/ck/files/49604193948.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092534c8b1e3---xugigasojerafavegelom.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c313d1ab343---28639148095.pdf
    • http://www.victoriousintl.com/new/resource/files/vizufupobajijem.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d36d319b3---58092657165.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608777fde90bb---52896893464.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607860023af23---36150893072.pdf
    • http://wsp.pl/userfiles/file/jujupanukik.pdf
    • http://scamps.biz/userfiles/file/7670095143.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608409a203d7d---riropufodamezirajadifo.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d3c03f628---xudawamamot.pdf
    • http://camel-republic.com/media/userfiles/files/nozixalubefijunomegiz.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210606120053.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_off0000e870.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 16792 bytes
font_01_sfnt_off00010082.bin
c40aaf7e83d83657ab57c3e0142e15d819c4eac699cdc81ae00166379d7b0870
pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 17136 bytes
font_02_sfnt_off00012cb0.bin
84723a4e9f416c738806f69a08aa95e99414f26cd8a733a548e4b85168e596f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB0 10636 bytes