Malicious PDF — malware analysis report

Static analysis result for SHA-256 a611e35ee15ab77d…

MALICIOUS

PDF

144.4 KB Created: 2021-07-20 07:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0271ea25c0f921c9481299d0c8eeb2f9 SHA-1: 6de282b3f7fcffad856ec4e456045e5476720134 SHA-256: a611e35ee15ab77dc8a74d94337324f2bc0afd5e123304f7ef66121933e99ed4
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting other PDF files. These links are likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple compromised CMS upload links indicates a pattern of leveraging vulnerable web infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2904

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 https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/fba8380dca6a8733ab962fb94632c580/55068682891.pdf In PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ceef5857dd6---wamawojalamatawimi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91573fc23---timalop.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/wowutalorawige.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e967cc3b4---podapajak.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df42a4c71b---14745602980.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/kupasogupe.pdfIn PDF document text
    • https://asiajitu.com/contents//files/xafefunosaviraxi.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/wuxofu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160714d1a87566---86423708138.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/92627569742.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/d9fdae1a68c4add1e598f0b82068620d/nesotugerukagusamelufiku.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa49c33eda---pumomixan.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/buvaloxekavenepozo.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/67016656857.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db2d585191---tokuzodinibuxudek.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3edbb5435---94764198640.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/xisifatukajaneji.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/49h6psjbtteu0vv43ilvb845u6/vikogizomo.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e7ce7f60e---notazug.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/4j13u4jhu0qm02p8mj5n452pml/96152108299.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/52276134066.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/vivaxep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=dash+meaning+in+englishPDF link annotation
    • 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_off0001ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBAE 10240 bytes
SHA-256: 57f4f284caaec881f2d69b59411025fe615534f2b89058107db3d75123aceb35
font_01_sfnt_off00020266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20266 1676 bytes
SHA-256: 08d3d5576007ac795ae6719f21099a96d4af1de6057acb6b0f60637119274493
font_02_sfnt_off00020a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A57 22024 bytes
SHA-256: 3f955220cb5bd48e1514a505192698fcd78928b196306af54a4f6c39ce008a70