Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad13fb8cf3fa4cce…

MALICIOUS

PDF

68.8 KB Created: 2021-09-30 16:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e072685afe99a1dd4555236daf62e5ff SHA-1: e10a3a8fe3665703dd9a2efbed3d631ca46a6cfe SHA-256: ad13fb8cf3fa4cce6fea1cb00f60fbbb24d575a4de8cbea46c53da6c8706e35f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document that contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggests a phishing or trojan distribution intent. The presence of external URI links and link farm heuristics indicates the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3855

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://allytemp.ru/uplcv?utm_term=little+panda%27s+farm+story PDF link annotation
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/73032950054.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/pajawajomuniwinapegazepa.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210925163658.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/54502516874.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/xagavawek.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16150bad16cb33---82280785064.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/350565e611211712fc12500c7d7c568f/zixagevarogujivegamoxiw.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210919025632.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/92138210898.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/zigajinefojet.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/damejemazetakuxanozuzovir.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/30539054336.pdfIn PDF document text
    • https://afayl.com/userfiles/file/14828940004.pdfIn PDF document text
    • http://esangsok.com/upfile/files/gobise.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/09225436c02392d5f23a0fabe1940134/nodonudatogusonekanobo.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/24477937506.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/jutiwebivokijunanigikin.pdfIn PDF document text
    • https://sin-wa.tw/app/webroot/userfiles/files/94662409424.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/fadixolojalapijolida.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/midobiwifaxavowo.pdfIn PDF document text
    • http://bienbao.org/uploads/files/sufupiboru.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/8182454657.pdfIn PDF document text
    • http://juicy-group.com/editor_upload_image/file/lekaxesumevadu.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/42732711121.pdfIn 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_off0000b293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB293 10764 bytes
SHA-256: e6319a6cd451686772a3c2ec3215770cbdfd7daeb830cc903272fb5421dfd497
font_01_sfnt_off0000cb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5A 17500 bytes
SHA-256: 58cf59de1431967d35735315ea10788ffcb3bea328eed73b991720737e75530e
font_02_sfnt_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1