Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90caffae56619d5…

MALICIOUS

PDF

76.3 KB Created: 2021-07-19 21:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 42a48ea5893789d1c888650754bac4e0 SHA-1: 49c2eedf709d28babdebac5db7137fe0e135c2e1 SHA-256: c90caffae56619d5347ba579f3ca3fbd8878cc1b0a77beb4003e0ae6e5d5cd2b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites. The presence of these links suggests an attempt to lure users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • 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
  • 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://gregor-biffiger.ch/userfiles/file/19932539238.pdf In PDF document text
    • http://wsp.pl/userfiles/file/59888459653.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/25680890947.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/jekexezutilulanufupud.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/puwunaferedutetuwoxiduzer.pdfIn PDF document text
    • http://ashioke.com/images/library/File/zuzewejuxesudawunidodi.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/kemiwok.pdfIn PDF document text
    • http://mcutech.net/files/43096731519.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d68aa976139c0a780f7f46decc932cb8/2762279231.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/gotepinulevudofi.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/vupalogusil.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf0631600---favatematafimekafitutum.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f65530df13---19608157245.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/47440023334.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babbf65b5ef---jevavutavumumikosus.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ef56d075481649bc11dd4cd9c2084b8d/87736551452.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b62e877b3b0ae1ec90620a64fd25b6ad/23025815634.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/rored.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/34640275028.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e58e0bb7c38---kasix.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ae2fa973136fafac79f6c62aa4a9e627/renesireg.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/babagevu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160873e1c3ab6e---vuxezajibutifidibifena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=math+square+and+cube+table+pdfPDF link annotation
    • 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_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 18296 bytes
SHA-256: 611ba846d1f4d0439d57f3fc4365ca3cc16cd33496ee6f9088aec8dc0dbc62ec

Open this report in the interactive analyzer, or submit your own file for analysis.