Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6aacb99cecfff1…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 20:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cf449b24fe2bbed54ad92089daff84ac SHA-1: fc7fb601a50ec31fab4ed7c497954988bee7f284 SHA-256: fd6aacb99cecfff192345a2bcef5e13ae0e39d5a5009079c750147388a73e607
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the presence of link farms and external URIs, suggesting an attempt to direct users to malicious websites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan-based attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4417

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://salkim.com/userfiles/file/858999110.pdf In PDF document text
    • http://avon-bratislava.com/files/files/80199163460.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210906135320.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/45581483089.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/19272776695.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/22711497339.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210916_BA7E70E0048282CD.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/xasikazokugojujirizi.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/fisanuwojonit.pdfIn PDF document text
    • https://defi128.com/userfiles/files/sukon.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/13244177411.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/cde3971223da42b8a80edb37371d3ea2/44500868759.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/51483646657.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/84666069640.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/45685379073.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/lowazemivikojogulel.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/77464850924.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c6a4e82c363c11a6c520c274a9d98810/78154316927.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/glnn0194fvql2ncv0c6qfui4qa/gejudabagipago.pdfIn PDF document text
    • http://atya.eu/files/file/logano.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137831f4acb3---31012762943.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/32186743802.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/54135143228.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/67037310435.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/duzomefajefemisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=abc+runner+downloadPDF link annotation
    • 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_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 10312 bytes
SHA-256: 2a97f76ab92b579a5af225f61416dc5d59b35d769d9a3d0fb40c0136ae659c52
font_02_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 18208 bytes
SHA-256: 00c7a75733d64675a6c56f86f3556f699dcd7578fa7af7be7651b4760cac4a13