Malicious PDF — malware analysis report

Static analysis result for SHA-256 413bfe9de035b56e…

MALICIOUS

PDF

86.8 KB Created: 2021-09-09 16:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10ae8610ac2ed1c9b383cbc08a2cfa85 SHA-1: 16dd0bb1ac118afe5e7493f613f77d07fa67716c SHA-256: 413bfe9de035b56e805136b41a67e6faabf253b24104c27227231973b349f0fb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm pointing to multiple websites, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of numerous links and the use of disposable hosting indicate a tactic to evade detection and potentially poison search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://sssmri.com/ckfinder/userfiles/files/ratajerijen.pdf In PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/nubisofakemasu.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/86329235646.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3b7b3f05---senimejurazabored.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/bcb6b471018ba31c1cbc8c652008482e/zowililejoxaralo.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/malirejosodujaxaku.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161351966e05c6---bexewav.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/kerunepogebixegemodofa.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/fomowanebikotogati.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/gutazik.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/givip.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/90363070416.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/vunob.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/pikanat.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/tazudafifuzonuri.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/nedameb.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/14963117528.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/mesemijaxowaleni.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/42677960962.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/53964133408.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/kubumuxevevusesufarunejes.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/91817206990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+gta+5+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 10420 bytes
SHA-256: abcb4e6617a59f5d8b8f2331f238935e058eed83ddd32799e9527f690f1a8496
font_02_sfnt_off00012106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12106 17380 bytes
SHA-256: ba6b9afb1c7ea2a02462587d250482876a95868eb0c4aa010224487c3554511e