Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cd75477a783371…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 00:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d956ad3215c73367fdfeb232ed15a53f SHA-1: 5ed362f002f85fcd1cb09fb00d9cb04b5069050a SHA-256: 85cd75477a783371f0a5ac915781140104f048495808ee87ca1fe69e0440e052
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links to external PDFs hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The presence of a PDF.Phishing.Trojan detection from ClamAV and ML classification further supports its malicious nature. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://warungmimpishio.com/contents/files/36274069540.pdf In PDF document text
    • https://coolinterier.sk/upload/files/46210980414.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/15514507559.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/18969106319.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/rasifakumutunovatame.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d76e57632a---90855745552.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/zowanoda.pdfIn PDF document text
    • http://koala-al.com/d/files/dukazugiliveriwujagiribu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hriq1fuhagb2emji418c02v6m1/xamuvaximoxinomokotudel.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/18955575958.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36943784325.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/suwosekasuzalapaniketerun.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/53188809268.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/6087165816.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/38268379573.pdfIn PDF document text
    • https://nyig.com/files/file/ripajuzemizitoda.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/20643977580.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/siwam.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/limupifotobagumamizuzonaw.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/40640896720.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/30872921070.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/4230256690.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/e6kijqbppnhsdlp11c6lcq0d84/87356924131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=merge+a+pdfPDF 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_off0000b171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB171 16608 bytes
SHA-256: e90ce20c81f6ec40f3e3d4d51b18f72df2c40007e32ff4c64d040c74e499552a
font_01_sfnt_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 10040 bytes
SHA-256: 997e606efd6535c83ea42ce3f60dfceafa035980865a3921bc65f7152a8b2563

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