Malicious PDF — malware analysis report

Static analysis result for SHA-256 650c1bc1de9be7ca…

MALICIOUS

PDF

63.7 KB Created: 2021-09-25 08:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b66dd6d4983551c9c47f49838739e780 SHA-1: 0043777930f19fc06132dc248b8d52f01970dc54 SHA-256: 650c1bc1de9be7caaa484aba8d4e30f1ea5c5c389c8f6664090bfa42e3739b63
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external URLs, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=l5r+4th+edition+pdf PDF link annotation
    • https://ctsgroups.asia/images/file/jufujivopawigelifipedusu.pdfIn PDF document text
    • http://micruts.org/userfiles/file/somiseximutubilejera.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/gimivububuro.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/78566150538.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/28026703956.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/42224889830.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/240952d77409ccb5aa89be794bf0df31/37989575680.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/miwupekavujunikamakob.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/mifasamo.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/78716331332.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/89930808712.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/16293915053.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/wojabuguxelex.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/tesonokaxonuximo.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/84162008704.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/2278351449.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/nebosedupi.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/84c7143abc77541c8ba73dae5f0c68c7/66503430854.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/rimojebiribefaxiwiposo.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdd4b124a---rewamise.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72622758142.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/ranevovejinavowuxufe.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210903090001.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/79501344660.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_off0000b526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 15720 bytes
SHA-256: f9cdbf8dd0bd1a5fd8fa89c98b43333fec29ae222dc02d81a7009c218ee6d189

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