Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a824a450217788…

MALICIOUS

PDF

78.6 KB Created: 2021-09-22 15:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 64fc95df528a1ef69f5e39eda2bb6419 SHA-1: 977bc2d466e5d2fdf951613733489a8e321e3d11 SHA-256: 20a824a4502177889ce606982b970c43ee70c743381763a3e62ef0fe88a8fc3f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

Heuristics 5

  • 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
  • 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://smidgel.ru/uplcv?utm_term=send+text+more+than+20+recipients+android PDF link annotation
    • https://mytalk7.com/_UploadFile/Images/file/zekeduwokinedogud.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/juwewonozojiwovupi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb3125e20---10411842367.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614103a262d3b---49689040751.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210908_0C6EBF0D262CF56F.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/wemanebabepo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vofikitobonadiluxadusuto.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/94738201161.pdfIn PDF document text
    • http://c-six.it/userfiles/files/sovanijo.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/fagegizasonuzegagujaza.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/18266914824.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/pewab.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1b5c5b98---95057209651.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/jabebab.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/dabez.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/lekuvevusekifubunozapubi.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/dirafivudasuzev.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/89530487380.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/3498395647.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1842196114614491bae22ca.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/linofuba.pdfIn PDF document text
    • https://curvy.tw/upload/files/febugek.pdfIn PDF document text
    • https://linardi.ru/files/file/jewine.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/211f7a1357cea11e086bfea5475aaf11/duwugarejasojag.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/96005696416.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 18580 bytes
SHA-256: 89f81d1273f3c7d1f3a342919c625af0a29d9c3882aa0107cb9fad966ee7692e
font_01_sfnt_off0001114c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1