Malicious PDF — malware analysis report

Static analysis result for SHA-256 410e8ec48d785f7f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-03 23:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f6e2b3eec40d989009fd5a739b45172 SHA-1: 0e647487aa3ba8395eca6f84ee89cd027acacb6c SHA-256: 410e8ec48d785f7f0d0480a9c045e01fe1235fba9c887579293553217e6b05ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure malicious destinations. The embedded JavaScript likely facilitates the redirection to these external URLs, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://tsutae-f.com/js/upload/files/89168687135.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67f4d71850---komajubabuvejojidazigon.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/avul6hdln9ql8chsu53ol0b8b0/28953625253.pdfIn PDF document text
    • http://ahchala.com/img/file/mizuvedevifapav.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114b8e155125---pujukixoradarunawefapo.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/zeluzeb.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/84e8112291ca1c7c65f0397667662301/memajikifojo.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/do2gcunhnt015sbenq9clj1fg1/25889235339.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/bonekunoxesoni.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/niborifixemudovuromozo.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/dunojenogodekefuruzidozo.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/69359809836.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ab35da268---vaxowagabipelafeg.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/23192748035.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/a0e7566dc7ccdbc6d3b491d8482a59ce/7349319644.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/10682090866.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/sobareduv.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/29462218183.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/17910870318.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/sunovalobojuwejepepezawe.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/mokanisodositukurogitiwap.pdfIn PDF document text
    • http://darec.sk/files/files/55351753960.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/soxuxubitopumave.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/20533923849.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fe52d5f75---zarulezatujubemezewekixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=diesel+engine+generator+manualPDF 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_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 17812 bytes
SHA-256: bd98c9a3b77b46cb28b85b4a27c09967a01b38a49587b30be65ff0bee28abcb9
font_01_sfnt_off00011a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A23 10552 bytes
SHA-256: b6850bca5c35def57ecf3cbcf6b963760c97ecfca1b5389f71ad82c0c9404f9b
font_02_sfnt_off00013232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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