Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ddbbe316bf0642…

MALICIOUS

PDF

66.3 KB Created: 2021-09-13 07:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 89f1c4b45863ad66eb45342fee61801d SHA-1: 1eb29ac67b7e35a96f8e6094c365e5a562c1971e SHA-256: 86ddbbe316bf064215d29e146ce3c3d80c859cafd077f0260ff375fdc93bc106
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are structured as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5956

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://cructi.ru/uplcv?utm_term=jiang+ziya+full+movie+english+dub PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tm3krt5nc8dblvq7pjnv9tqec4/24400757506.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/petiweregijewe.pdfIn PDF document text
    • https://andhimazhai.com/images/files/bebijonemagawalisuvi.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/60088150759.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/desadotitipafobip.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/rokitaferasikaramorokesep.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/babeniburokajesanosex.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/1146794557613ae002cf941.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ab6a4308---puxiwababu.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/xukazatuxil.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/48685305598.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/76990198308.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/58241814555.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/91691639459.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/3043311616.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/miraxajomonorikadikav.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/pibiwapekudakaba.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/goposisum.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/75797701384.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/80816259574.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138ecdda879f---bonudevirijewubavelevogab.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/rabotitamipuxe.pdfIn PDF document text
    • https://tonitomov.com/picture/file/76514960658.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/31952978003.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_off0000bd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD00 18772 bytes
SHA-256: 3fb7ae4df1f71741105407466ec40d27e6c9c5dea2e2746d9a9e1560fc431437
font_01_sfnt_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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