Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acdebd4fac1b3de…

MALICIOUS

PDF

69.6 KB Created: 2021-09-13 16:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89826ef8d2c52b0ba14b32346a1bd2af SHA-1: a3e09e41d6671a3d39418544253c1f7fe37fde6a SHA-256: 9acdebd4fac1b3dee79a73d29ab97353f7e2479c858086028f3996eccf49ed66
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://plenaseguroseprevidencia.com/fotosempresa/files/wulinusojuziparag.pdf In PDF document text
    • http://zlhk.ru/upload_picture/file/82312331912.pdfIn PDF document text
    • https://htchninc.com/d/files/96177940102.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/kudawitenexukapuwanu.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/vekudojotudelipozipuluji.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab916c93eb---2442103791.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d4a71025---vosifidat.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/70d2b9a9c28daa9790ff2d206d2989df/gowugogujozetezu.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/92553396719.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/24406846747.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/89362190913.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/wibifejoduretatugix.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zabotofumugulavawotub.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/38296335795.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/69252583753.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/58469514330.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/54066562313.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352df344391---giwazefusenatarowurubegax.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/jidafejigafawelizaporar.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/267b5f3b9da37441d994d38da4dac960/wuwalunanevoveguwuvigede.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109112147546238.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/54700161268.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91311535808.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/36287184408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=free+money+drop+gta+5+online+pcPDF 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_off0000b332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB332 14720 bytes
SHA-256: 1d827a8092d014b91cf78078d71a3c63d8418231ca0207980548e73b0eeb7fc8
font_01_sfnt_off0000d7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B3 10916 bytes
SHA-256: 2de9dd009308625c6eb1e38fa54e1a838af733ee93a59b50fd58d245c7af66e9
font_02_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1