Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbf3081561bc37d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 03:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3dbfeaf5b463cd49ed9f25cfc5124141 SHA-1: 7bbf5f3101a4d207f5e5670f188a119c9603ac78 SHA-256: 4dbf3081561bc37d339739afd37342f4bb93d2989f5b3c9ca3aa55876d2310fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the nature of the links and the detection suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/pmgf2q2n1ndk5llib6p3gor5ok/gefive.pdf In PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/81538064373.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/676657991.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wufikeratomoradipetiban.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2d178a4c192e2cf634afd5e75e7ee116/botukiwezajikoveludaje.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f3864ded11159dcbcbcf13dfcd2db135/5172335023.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/49992269091.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/eb79a66522a290357f8b328271dcb4c6/67766073642.pdfIn PDF document text
    • https://esvigo.com/upload/files/nevotuniren.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86ae7b00b---xosedizinimufazudigov.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/13814267151.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/befiromivikewiti.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/0d896c2bb9909e64fc7742c7dd1ae12b/vokaposez.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c63ung8qbh0tupsc78shpkvlc7/pogemiselexazox.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/vedelafinu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ktp4d2ivii8e388l8aj83s0hvc/wujimi.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/86869583471.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098f118cec32---45386462405.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fff8cc060---vajekepegodabaxuno.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/97971117577.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/tazidofuriduzut.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/65064964101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=exercicios+ora%C3%A7%C3%B5es+coordenadas+pdfPDF 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_off0000cfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB7 10976 bytes
SHA-256: 1c0d58ab2d4ac933fb1d921d4fb7f20b80724ce152372c5b9860d90d49a1ab57
font_01_sfnt_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 19316 bytes
SHA-256: 39e0245ba5047a6478b8145ae04a7c98ec532d8169e779bd6c0ed2bcbae53537

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