Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4dcf24e566800a…

MALICIOUS

PDF

83.7 KB Created: 2021-08-19 04:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 510dc9810a980e8777fd9b61c505aafc SHA-1: 95cbd117e1cdfd453b379cae6d0a0bfa9d9667c0 SHA-256: 2a4dcf24e566800af043fab4d765c3dc82a3f26fb2351adceeac4130b51fa162
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=chevy+truck+manual+transmission+swap PDF link annotation
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a294c7eadf8---gegatataguzeju.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/1439052557.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/u4f6bdcvvjo9m4qa1jtndh41c2/megakog.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/20379797691.pdfIn PDF document text
    • http://vo23.ru/upload/file/mepudopajerazerugamus.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/2bddb9485828a27cce39658ac99ef7cb/99500789197.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085f6e2de606---40269275521.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/93969604801.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/ravutulonopij.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083dbef3f9e9---vonefibavojeni.pdfIn PDF document text
    • http://gtshotel.it/images/file/76619452416.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210613_15C242A3F5D9EC16.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/49257052557.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/1u1na424dcarbg76tctfqtol39/80902616556.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/nerurijeguvazaleki.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0c8373ba4---bixixalawananinafopi.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/25887018867.pdfIn PDF document text
    • https://amblamy.ee/upload/file/74297736459.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/wuwadon.pdfIn PDF document text
    • https://schmitz.cz/res/file/kujupowoporelet.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2dec73d0876a055819f72a22f238cc04/69148955486.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/rikubutopew.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/dda729890d19f71a819d3642e5e0e32a/sisofimomarupiwatusel.pdfIn PDF document text
    • http://metapolar.hu/tmp/tutidex.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_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 16480 bytes
SHA-256: e7937961dd9dd769b68c176b173dd4322c3cdea3fe3d30f6f8c6b4fa6bf9b19e
font_01_sfnt_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E1 11128 bytes
SHA-256: c2e843f6c6da460b27ca421512823796e6de4fd91d73fd2b77badfbd46c537ee

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