Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bacb6f51b7def83…

MALICIOUS

PDF

71.5 KB Created: 2021-10-01 06:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3f982ad5d30dc42c4d208cfa1679018a SHA-1: b19dfa57359b5c6bc3bdbc12f7a018c4b58d6537 SHA-256: 8bacb6f51b7def8313c8d392d695eb8aefca94f1eadf297d1eb0b1bf9ec0358a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://unseenadventure.com/userfiles/file/gerusonukes.pdf In PDF document text
    • http://murasakijr.com/uploads/files/barenivoxotepuzipirupime.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/47246599462.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/zudupexajulo.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/wafaduvapajarawuwekubaman.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/22690234600.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/65064998502.pdfIn PDF document text
    • http://autodilygood.cz/files/file/zujidali.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/tififugi.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/pamapuxodatofabuvoko.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/siwuwatefeludugav.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb990614a5---34837673846.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/40042477650.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/35698388151.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/xenubokif.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/76700281472.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/zaxof.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/jobutowibefigutitugef.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/tixizitope.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/79789733344.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/46270616672.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbbdcf55b---semaretozawobor.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613384524fa46---xafonunivapuredonomop.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/dorudowijiregoxufidebuni.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210911165511.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614b87b2cd2d5---nolemotezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=adb+and+fastboot+drivers+for+windowsPDF 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_off0000b6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A1 10576 bytes
SHA-256: 4bee1ae5471ce57cc17dac27a1a51d4a323be32e6cde125421003286a9f48784
font_01_sfnt_off0000cf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 15984 bytes
SHA-256: 1f047bda081762cec54d9da8912ee0c904ab4e7c9efb6430083f4fa7362ac563
font_02_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1