Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fd86f0086ab458…

MALICIOUS

PDF

87.2 KB Created: 2021-08-08 03:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2bbb72c238067142bff988d520f1687c SHA-1: 87efa8f326e65c8fa3fa1a5a12a84ab246be66a0 SHA-256: e4fd86f0086ab45801da75917a18a5e298d2c28100baabab5c15f6ff91602e22
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains embedded JavaScript and numerous external links, many hosted on compromised CMS upload directories. The presence of a visual download button lure, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download and execution of a secondary payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=what+is+jelly+slang+for PDF link annotation
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/rorajapejumeretavexoxil.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/986022c15e3bb8dcdcc14202db254c11/mevifate.pdfIn PDF document text
    • https://agermag.ro/mm/file/zumakorapikapoliwepabex.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/27886631700.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607340a190cff---megupugogavejirul.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/jiwujotefemam.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/70053926574.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/tr2uv6a9is28g485cadk8m4ksl/50571717202.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/l3dt3kjkdn6oe89p4cfb3i9q9i/zuzowamurutoj.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/kapejosok.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/21742482482.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/221f7863202233fd8bc5d6beb58b3d06/fowokirebabesi.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/81eeb6f573a32d72a6477fdbaea8c175/83312323870.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/89215166655.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/juxaz.pdfIn PDF document text
    • https://afayl.com/userfiles/file/deworapufuwajezijakaku.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/pizerarit.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/61354112039.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7347ca596f---jolunelovedorutujol.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/mulepatumu.pdfIn PDF document text
    • http://techbis.pl/files/file/61883627186.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baebe86170b---41253557.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 16552 bytes
SHA-256: 0d2d6347085856fa997b9022959d3b81a5fe7160171d9a29ca2bc47e5c87c81c
font_01_sfnt_off00011e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001362b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362B 10728 bytes
SHA-256: afcfb26eeb1abf709bd26eb6fd466070c6290aafa30cd17fbd4c5fc54e4c04c4

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