Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8b986d62f0e5e7…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 02:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bbd53803a29dbf518c5c65b43f08e384 SHA-1: 5a141815e282de71673a8a2acd53f7aa9edf7395 SHA-256: 7d8b986d62f0e5e747305e3df3dba9a087405af540fb22a9db76f137dfba3c47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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 http://studiolauramoschini.it/userfiles/files/xajuxaxelanunuxe.pdf In PDF document text
    • http://beiwendq.com/userfiles/file/mefifotamotiwofaxewezu.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/paxojido.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/25834171841.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/mt93vk1lu5ja47tujhin3ks9o6/fezinogefulol.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/topujajevewitakotepuvena.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/xokepikojewajejupemi.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e3e7c83553bb502ea791f0a9fbf967fb/77327295094.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/pobuwapakukumefito.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/54818608820.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/labupagabisopalemiralo.pdfIn PDF document text
    • http://skupka23.ru/upload/m/babogusovurogef.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/44509967106.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16145ae5ad0072---43487374073.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219131649298405.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210916_212932.pdfIn PDF document text
    • http://asustainable.com/global/file/waxodipuzupofid.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/72646370038.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/nekuvozakedo.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/96068906753.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/70524297310.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/femejogisofexulete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dragon+mania+legends+unlimitedPDF 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_off0000c624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC624 10692 bytes
SHA-256: 92c561751a308114b0c6b3d070ba25a08423b7dd441d78726c8b70cfbb084ad0
font_01_sfnt_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 16020 bytes
SHA-256: 50d0fd3c55e69e228eeef710fef4fd8f1df4cd9a58d979dbcc3d69f476b5fbfe