Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5032eeded0f1852…

MALICIOUS

PDF

67.9 KB Created: 2021-09-19 05:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8a6771bb7df0c5a67c8849570f8f6cae SHA-1: dc6762616b5bc8c9e43a741cafcd0466ca3d690a SHA-256: f5032eeded0f18525f361cde8fa18c7d17f23a09b2a14345118632de125dcf75
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. These links appear to be part of a link farm designed to trick users into downloading files, as suggested by the 'utm_term' parameter in one of the URLs. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3555

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://chcial.ru/uplcv?utm_term=sure+universal+smart+tv+remote+apk+download PDF link annotation
    • https://okinawa4d.com/contents/files/1911295317.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/mukakivuwutivepepixifeb.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/82194809115.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/76044081308.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/37892939062.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/55439773692.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a11471cfbd---14804714838.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/75212535695.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7c488e521a965d59656cb26cc90b421d/41009321673.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/wiwazoge.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/jawepadim.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4b8b844040f219e4066794f00618380f/dujamixewebolativitite.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/85883996508.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/zubosuber.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/68230610981.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/vaginumiletofipi.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/32869496350.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/sopurumewirix.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/77981239879.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/kijonunonowim.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/73665473168.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/17955649815.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/82105792422.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/28373506610.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/22476393914.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613494f35023b---60832120026.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_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 10972 bytes
SHA-256: b8fe463a63338a067570e4ec5d23ef25f5db49347fc1c4b207d6f42e05ddeff7

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