Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc56f691010de1f…

MALICIOUS

PDF

76.2 KB Created: 2021-09-21 01:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8208713db96f02924ab9a110758ae442 SHA-1: 51f98195504a9de25eb76df1ff4d1f7af447512a SHA-256: 8fc56f691010de1ffbccd7b96b8177342381c4179167190d905a61572d484d0c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan distribution. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content or download further payloads. The presence of multiple compromised domains and the use of link farms suggest a coordinated effort to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5565

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 http://taikenplan.jp/ckfinder/userfiles/files/90192945824.pdf In PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/suditugovezuvojevakilexo.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/mozapeta.pdfIn PDF document text
    • http://nemochem.cn/upload/files/rudataro.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/viwuferinudugesanudususi.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/94632845455.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c931712bc---47549480513.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec276a43f7---65791374105.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/ripotakilasibodisujaf.pdfIn PDF document text
    • https://koratspring.com/upload/file/99333913376.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/lubafuvesaxa.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/93083547510.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/55788876299.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161438b8ea58a8---96922962450.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/p94b5ujs4e00ril12fqec6d44e/39583473995.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/96092415760.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///93919910909.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/dugunezuwum.pdfIn PDF document text
    • http://djpress.pl/Image/files/61278166188.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/61007661803.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/24710203371.pdfIn PDF document text
    • http://vuason.vn/upload/files/kegusinapinefoz.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/63276884981.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091617232_367384461.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/sejuferodevoxesaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=i+now+pronounce+you+chuck+and+larry+putlockerPDF 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_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 18992 bytes
SHA-256: a5078bb528c87bdc6f00c29b514aa877fe271ebee3d99e4a91a74bdc106ca858
font_01_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1