Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ef654449e606d0…

MALICIOUS

PDF

74.7 KB Created: 2021-06-06 10:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d47a35c918f0b38bd1636faec13444f8 SHA-1: 6652a2c8c5c520c69c70d814a0ff54acbbe94022 SHA-256: 66ef654449e606d0f4a1bcf1b0a795d8178386887b379c5592294fbe397a5ab0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'Clash of clans 2021 update mod apk', indicating a lure to trick users into downloading malicious files. The presence of multiple PDF URI heuristics and a high ML score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ketchas.ru/uplcv?utm_term=clash+of+clans+2021+update+mod+apk
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2d34449e538bdad2d7ad6e1329fe4818/rogasigonaxetutomopefi.pdf
    • http://i-daa-wl.de/userfiles/milupemejat.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a5fc1b58573c2875355bc51fba73ecf4/56359427798.pdf
    • https://zivotzaokny.eu/res/file/sexuvonafo.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a61713aac---rifonume.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecca8d7d26---lepezoxizojukizev.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982ecfc610d---nukuk.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a833bee54---satoburemugepuwewanef.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab52e1a9e5---bezijomatamimobibata.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882794cd944---ginalupaxagazuxonabazur.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bd70373e5---54616429669.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/3kj1j3oo81nvdpl8c51cqttm99/zebevaki.pdf
    • http://www.annaleehuber.com/content_files/file/7690402933.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d0349ce73---muzokumiwaveladazipo.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7f2bad239dde31e75bd41a91ae350a82/tigoxawanenipez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e762.bin
d358f49bd42c2ef0847db543f0cb2b77dfbfb8155a72fff68be62f1487bcc8de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 5596 bytes
font_01_sfnt_off0000fa46.bin
8a0802c97eef73874fe829d6785c36df9e03cb512b25f11882e913559a4a5f01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 10524 bytes

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