Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14a9bce58b9ec27…

MALICIOUS

PDF

87.7 KB Created: 2021-09-15 11:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3337b43b4b446313cc0445c1f9ddadf8 SHA-1: 49a974718b37a36eae5cc909e7fdb96e58635ca6 SHA-256: f14a9bce58b9ec27e4599e5a05b19bcd17facfee6b0ccefac3f7848b8dc5c4b7
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Static analysis revealed embedded JavaScript and a link farm containing numerous URLs hosted on compromised or disposable domains. These elements suggest the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3632

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.
  • 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
  • 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://irlanc.ru/uplcv?utm_term=grabar+llamadas+android+apk PDF link annotation
    • https://needlugs.com/userfiles/files/lilibifulukefeguf.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/letag.pdfIn PDF document text
    • https://songhongresort.com/img/files/20130147304.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/63543014083.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210908_A0C2BBEB5BF74092.pdfIn PDF document text
    • http://bushurov.ru/images/files/79777343884.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/runeleg.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/pafatazidot.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/55701162858.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109120227502744.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/puzilaf.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/pakixusuzej.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/82348870213.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/52607926895.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/dopivexuzoxof.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/92902487111.pdfIn PDF document text
    • http://gardatrans.com/content/Files/63745464827.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/lokutiguvuvipavarezimafo.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134714cbc5d3---15811761017.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/45200606379.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5068221f5---29315380791.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/fagubisalan.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2b4ea4af84c6d0af58aac0c645a87deb/16407860684.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/28177460753.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/29034283819.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_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 10592 bytes
SHA-256: 48bcfece70496f4c1edc40c3d7a506a180b2f878a8c1e4a31cccc79e66b84b87
font_01_sfnt_off0001221a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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