Malicious PDF — malware analysis report

Static analysis result for SHA-256 5573bef30527f540…

MALICIOUS

PDF

89.0 KB Created: 2021-09-20 17:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bff893bcd0bce2ad36245cfa51104c6 SHA-1: 2ec0abb098240c30432df8adeaad6fe492ba996c SHA-256: 5573bef30527f540bdd046077d1754747f45f9624b09a8cbfc0c0034e03f54de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing trojan. It functions as a link farm, directing users to various external websites, some of which are hosted on compromised CMS upload directories. The embedded links suggest an attempt to redirect users to phishing or malicious content, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=best+rpg+on+phone
    • https://drlalashow.com/php/billboard/uploads/file/4202761964.pdf
    • http://danangsculpture.com/uploads/image/files/47715029301.pdf
    • http://tinhdauvietnam.vn/upload/files/82255433836.pdf
    • https://sieuviet.net/webroot/img/files/zufutokujujoweku.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f355e78f7c---13724764358.pdf
    • https://ddtoyz.com/ckfinder/userfiles/files/gunoxus.pdf
    • http://biolabsrl.org/userfiles/files/dijonipavarafinufuwusu.pdf
    • http://iranjobex.com/cache/fck_files/file/61635782781.pdf
    • http://bio86.fr/userfiles/fichiers/gemadinugariratilorutito.pdf
    • http://yogo110.com/userfiles/file/80240985067.pdf
    • https://danielstrehlau.com/userfiles/file/nitot.pdf
    • http://polaryachts.com/res/wysiwyg/file/23766210628.pdf
    • http://trans-serwis.com/userfiles/file/witosirakexofixumeval.pdf
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/tokidotowu.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/kqbu44re7iijaom7cb03kun5jm/jixefobove.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/nowinatiso.pdf
    • http://ace-pharm.com/upload/files/28023434879.pdf
    • http://acecaalcoy.com/userfiles/file/sinepe.pdf
    • http://kftchem.com/upload/files/pudivazedajewimikosobe.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f5936aef5---13152569788.pdf
    • http://erainbowrealty.com/userfiles/file/donuxidal.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///motinetovobixe.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/gefovowinafefik.pdf
    • http://tourhong.com/FileData/ckfinder/files/20210920_CABACB99D83D7637.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8bf.bin
aea2342af49db2d47c58509d059d5ac6c8e9d367277afe01f96b3966aa151f4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 17916 bytes
font_01_sfnt_off0001275d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1275D 16792 bytes
font_02_sfnt_off00013f74.bin
4afd7e9713ceb7e0eecb643c7a2866d832557f3934cf9182802437dfb9589417		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F74 10284 bytes

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