Malicious PDF — malware analysis report

Static analysis result for SHA-256 058e789c2ea6df8e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 12:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 10182cd473b88803178bba3199f8774c SHA-1: 8c93ba5d33685b533f9213515fece5e205d774ef SHA-256: 058e789c2ea6df8e3197ec2709f78019e485e955ece050f444f3a13548ff67e2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern observed is the use of a link farm to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=dear+martin+full+book+free+pdf PDF link annotation
    • https://kenkochaya.com/user_data/ckfinder/files/13200832151.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/42153428252.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/10778646327.pdfIn PDF document text
    • http://devveb.net/userfiles/file/sokujogurowoba.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/83713395901.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/teruwafobosobe.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/72002894.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/51417624904.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/4516761622.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/74292276544.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/lujokujurirobiw.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132838a66b8b---31614019636.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/wimitijuwojiteda.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/babeg.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/nogalawijulepan.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/56790208638.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a94568c72---vumado.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f05350326---62305419337.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/sijomaniwejutoxovob.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcebf54f24---vuwujipo.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/v55fkm3rv7g50te8ff7aqbprl3/vusakibodibixasukileki.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/nulefevarelovosifa.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/xalagobazozanutunav.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_off0000ce03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE03 10824 bytes
SHA-256: fb0317a49a9585cb6cd48952bbf9612caab7252f83164fb784b7cd2ee2ec6300
font_01_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 18380 bytes
SHA-256: 3cb7747f737f4521da906ca7ba9f475c7eee81b51425123635049aa4cee2daf6
font_02_sfnt_off000116c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1