Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f4bab9ed20c781…

MALICIOUS

PDF

77.0 KB Created: 2021-09-08 03:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 80883eefcb27e6d2156277974c7dbc6d SHA-1: 1fcebb7bcabed1c7e3f41f274aabc1a8811862e2 SHA-256: e1f4bab9ed20c78175ceadaca76c9e456bd6ba22bae46142a4ce7eb5b7d30d15
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a phishing or malware distribution lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7511

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://sbox-technology.com/upload/datoteke/26819805176.pdf In PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/putamonevazubosi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995eca3c134---8288718336.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/winodejevutofo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dab57c3f53b---88663242077.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5d51c9428---sutogaxupaso.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/19021575610.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/80197018763.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/41872647325.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2mi9u5sfo59ubib9tg6osb18o5/74417524292.pdfIn PDF document text
    • https://media-get.com/userfiles/files/98845542143.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912a0b2e8ac---nowafavevozel.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607374b28729c---79856988765.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c03d1c8546---penigebosegusoxemivune.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/roledurexajixukijewog.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/wujujilazaduva.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/pofetozepodazuladu.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/1050325055.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/t33jjoq7aur4b6n46vnr34sfte/rofamugexikulutijekit.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbce116b8ee---44391603966.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/11652798606.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dce5a5ced---96931823259.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/42523527389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D8%B3%D9%88%D8%B1%D8%A9+%D8%A7%D9%84%D8%A8%D9%82%D8%B1%D8%A9+%D9%85%D9%83%D8%AA%D9%88%D8%A8%D8%A9+pdfPDF 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
stream_006_off0001226d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1226D 7703 bytes
SHA-256: b61fd62518d19eca4c2d98c2e45a2b9ecdbfcf2d0ad101c238b50e74321c9cb6
font_00_sfnt_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 22068 bytes
SHA-256: becc046ace702d11732b294a44bc61fffdde3a9ab1e691e2d755a5cd906c949f
font_01_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724