Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d42737a6ce0f7a6…

MALICIOUS

PDF

84.2 KB Created: 2021-07-14 00:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6cc2f5375d2490a06ffe13156c359a2 SHA-1: afa667157fe6cf4bd9acb8580d93ff1e28c4336c SHA-256: 6d42737a6ce0f7a64373a309c46fd46268b6ca165ba069b50248cbf5b1b7fc33
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing formcraft or super-forms plugins for file uploads. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution intent. While no scripts were explicitly extracted, the structure and heuristic firings indicate this PDF is designed to lure users into clicking malicious links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3778

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 http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57b9d0ee8---12743093477.pdf In PDF document text
    • http://arci-mp.fr/admin/File/68261855421.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb94c16b11f---zivirejagojazupib.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/251439855fa9dd09f5ace311fbd75bdb/20366256485.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/68405601320.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec1382a830---17024871192.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/suwat.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/jasepisapodenoko.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/kanakupujuli.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa42f891763---xudapujifejupomofo.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8b8483dafef2e2129e8e41a1be1fb201/xubirekejigur.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc643856a71---padivavi.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/tovadasiku.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/buvoligatawovukag.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e0461bc70---zapubij.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608989f0a2ee5---48621672340.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/5875279185.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/69025772070.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/11359403465.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080065568bf9---matuwomagep.pdfIn PDF document text
    • http://minerva-collection.net/files/files/38529822079.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/vemijovinibesefu.pdfIn PDF document text
    • http://ktcz.eu/files/files/72429819018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=words+with+many+repeated+lettersPDF link annotation
    • 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_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 10852 bytes
SHA-256: d719773269b69693d72525eaf06dc56e267b1deb5f672e8627c0fc3adab33547
font_01_sfnt_off00011015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11015 20032 bytes
SHA-256: bc3ccd6fb4ee669ec72a2d77e8b97c15165b92cfe691c2223ed1ad589c755649