Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91d094d3f863096…

MALICIOUS

PDF

95.5 KB Created: 2021-09-08 09:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b94072decece1dad9d3aa61aebdcf83 SHA-1: e46877419c0a2af5bb6edb99834e378236f40825 SHA-256: f91d094d3f8630968bb4a0600843908a96065f52d06990a83ff27be4c69ed13a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites and disposable hosting. These links form a link farm, suggesting an attempt to direct users to malicious content or further stages of an attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://i-chat.tw/js/ckfinder/userfiles/files/68075600619.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e94d91d0---rojali.pdfIn PDF document text
    • http://imaginove.eu/data/Files/zupokuvosuvanigafevafone.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613805ba6e538---mitujog.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/94673699716.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16125b9da78fce---sazebuwuxununikozogap.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd20ce8f61---62816816952.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/14265470369.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/185075fb51f7ce4e778e76e410616710/nuvopixakotufo.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/jadikuromebaba.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cad5e7d3e39f07882161af1cb985740c/fajog.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/0feadf50c052306cdfe2031e6118a551/dadupuk.pdfIn PDF document text
    • https://chp-travel.ir/data/file/33199780709.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/80146082179.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/wefidobu.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/suraxete.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/58760150057.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210602_54C122EF9255ED91.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076a335be687---kosoxiwinot.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/da8c265e9b5fb41c35217e75d61634e1/51154903952.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/81299994386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+human+animal+pdf+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_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 18308 bytes
SHA-256: 57d9d6f6c4c48cdaf31f48d1e2e96ff86ecd294ad7dbe7ff4c5ecee7b64fd9f6
font_01_sfnt_off0001408d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A4 10548 bytes
SHA-256: 6ecfc3d0d20b012f70a3fc2bff50fa88b1146dfc96430b5d882ba2e51252d89b

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