Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95e9afc102cc9b8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 02:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0673c3ee17cdab8575165126702301e5 SHA-1: 8fbdc63b3819ff91701875c569802a586717d5f0 SHA-256: f95e9afc102cc9b8d29d80bc3b5a01622bc1662de546aa92aabf7d882b47f72a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs, many of which point to potentially compromised or disposable hosting, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports the attack pattern of using a link farm for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://textosolutionslinguistiques.com/upload/editor/file/34611083719.pdf In PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/pepadugif.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/75087419320.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/dunelazite.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/676499267.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/fejefogemesufiwaniwom.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/38145092654.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/gunawubem.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/tujejoliragusenusox.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/zidefuduxofilit.pdfIn PDF document text
    • http://eva.am/files/772e5cf5a4a67f7f.pdfIn PDF document text
    • https://lorus.rs/files/sowen.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/98702cc97e2a50f35f684beafb4a830d/3665938282.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/12411142255.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/11767438672.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/78676801221.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/96604920816.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/sefumobo.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/7f5924a7df50bb81dd573f06440ff7c7/94574163946.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/dakumegizatetefakuninijit.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f5f29e48e167d57fd3df81d12b8aa524/87188926696.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/2039392036.pdfIn PDF document text
    • https://hsse.cl/files/fomelov.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/13402026896.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137bad864920---51928059168.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/pagasukaxeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dual+boot+ios+13+on+androidPDF 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_off0000d815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 17548 bytes
SHA-256: 69ab569dd192f56f012b3c770572b123953cdd600ad260168317c099f1c8e1a5
font_01_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7B 10576 bytes
SHA-256: bdbfb77a044776cef410c9f24da1347f56a6a28f6587875db1a7279d8cbc3e95

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