Malicious PDF — malware analysis report

Static analysis result for SHA-256 279e966e5808de71…

MALICIOUS

PDF

86.8 KB Created: 2021-09-09 13:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d1e1b9be188aca5b1fe4552831a095a SHA-1: 39b8a0d510b095bb7f96bdb084548fe57797bb69 SHA-256: 279e966e5808de715c817e438b24d7a4aefbf90d1c4c6d980dcf1cb10c477860
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded JavaScript stream and a large number of external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://drafthe.ru/uplcv?utm_term=gta+vice+city+apk+and+obb+download PDF link annotation
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/xujulizulubuxulif.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/gifavu.pdfIn PDF document text
    • http://krupongs.com/images/file/gavomomatuveguba.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/31941541389.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3797c4c1bf073c948279b83cd070c5e7/34481342652.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/48047401039.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130329ea96c3---fosukadizez.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/87617426751.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/60198116297.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/87451018854.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/24949338492.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/36302577474.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/44197927382.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/kapopilaxe.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/j23rvh1lqn0uv530roq6eb6l4v/nakofalugakojafivimiki.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/tusuwitelozi.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/99284518006.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/38226792860.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/86083765793.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613773936ad97---22125004041.pdfIn PDF document text
    • https://orrizon.ru/images/file/wisejaxi.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/5655510282.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161304bc375e5c---14029739246.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/soxupagexebimiva.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/57685922782.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 22220 bytes
SHA-256: 6156d6503498dadc43d6a71261084a5c9dc0f01e313161afa35978691c447f7c
font_02_sfnt_off00011eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 10776 bytes
SHA-256: b11bbe75820310e928d9b8b792bce87fc58512279bff4de62cc975beb6088993
font_03_sfnt_off0001377e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377E 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5

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