Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1dd11cebb6b6179…

MALICIOUS

PDF

99.4 KB Created: 2021-07-15 15:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b286b082e6c74ba8695ba803e266051f SHA-1: 454d5f5c95686b6b397dcad3c2f0bc0262abcf58 SHA-256: b1dd11cebb6b617926b60842064b93e423d52807752b0802dc74f79cdaf8e4ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous links to compromised WordPress sites, likely intended to lead users to phishing pages or download further malware. The presence of multiple links to disposable hosting and compromised CMS upload storage reinforces its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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 http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803ee85269b---zosavov.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/75bbb64421d1ce044ab8eea18a66d2c3/50558146500.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ev3egr9gsnauurj0o4goiqr41q/16014269468.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2103f514abaf4269c6c1f885bb694aea/83704626739.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/66ff2528b218e3ce99a65a1741e3df69/sugagibaruvizoligusodul.pdf
    • http://brenna-ski.pl/userfiles/file/vilejupusun.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845b708e9a2---91182871496.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eabda63b01---bawodaxiropisadirizo.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1a1cc7cd---2214858428.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9deb867b2---jafeti.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160718d2472e67---7098292241.pdf
    • http://superplasticizer.cn/d/files/wirezipuvu.pdf
    • http://qiangka.com/ckfinder/userfiles/files/71249737696.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58323002e5---fagejefiwusivebodopo.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f69551b9---sapozerapuvuragofiwekiju.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7a8b374bc---rurufebazipetupopewet.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d8323fb2337---41482083671.pdf
    • http://jp-cable.com/d/files/65901527515.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16079539eb4abb---14924654368.pdf
    • https://moto-trend.cz/public/files/fck/file/jizajitaloxunikuf.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ebcc3f29fdfb693131bd86bced9823da/sadifenajazemapiv.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/eaab786b5460df6d8f15d4aefefacf3b/54894942581.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/1jf0q80pm9mar6csi2cptl0paj/41705321649.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/fb1190dea91fed6d9519986abcb9d672/95518528251.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=clash+of+clans+layout+level+4
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 16792 bytes
font_01_sfnt_off000123c4.bin
0f838578c0d853ab23aa83aa902742f7f2bb6fd2cc4be9dd6291f11d57d58627		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123C4 17648 bytes
font_02_sfnt_off0001524b.bin
18e5111441bd560a3a2866223f283f8d6d8dc9b29b45c079494d9631afdfae11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1524B 10628 bytes
font_03_sfnt_off00016ab7.bin
a31e141fb2917ac6221449cb8c95e700680d048453672ad8ad57cd6853c5c53b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB7 16108 bytes

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