Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9477991a2f281f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 21:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5eafafccb596cee6d47e6690f5de507e SHA-1: 469bda3f304fdfb490eb4a2239cf499519a70714 SHA-256: 8d9477991a2f281fe11cebf66b0983486637a5dea73f179f1e6947d0070df737
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a security bypass instruction strongly suggests an attempt to disable defenses, likely to download and execute a second-stage payload. The document also contains numerous links to external PDFs hosted on various domains, some of which are identified as potentially compromised CMS uploads or link farms, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 http://jinwoosmc.com/userfiles/file/83173145787.pdf In PDF document text
    • https://akconta.com/uploads/files/72401475684.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613997f71a33e---2118568141.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/37373832968.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/71635486162.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138537ecab55---85993058072.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614389797abec---pizazojijoniseg.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109130238207164.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/720399927.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210905_A837B3D9CDB4A445.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/bigiwezida.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/c3pg0aqecefgbb3e7b6j3nnc4v/44247264355.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/kujezupixadanu.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/soperutiruwu.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/87851784ecca7c5791847ab721c9922f/5100777640.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/12376477967.pdfIn PDF document text
    • https://agrando.cz/files/file/72332278022.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/dogezebezabokil.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/59005616483.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/mewesemu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143326c4e92f---46713926120.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/55204485856.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/265f60d665033833c67d960c66f2eb98/bipunimiwufelowiki.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/sutisepidizote.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f108f639e0---sokifumatavig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cod+modern+warfare+4+free+downloadPDF 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_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 18372 bytes
SHA-256: 7a4a53b4e94039f174569eac7440df30ae78aaa9dc3d65efe6da3e6eac2b02cf
font_01_sfnt_off00010730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F47 10352 bytes
SHA-256: 31227c44594902015fa08a99612a362f31d9cc974258ad3ebbadf04410f23305

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