Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57025aec520c68e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 22:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa8b9010b52221df263936bedc56b93f SHA-1: 8f1116a67f13a385b36db566e04a66871fb998b1 SHA-256: d57025aec520c68ee963d69556465aec90d3efb0897e5307efd8cf29c74b1acf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous links and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://baptistfriends.org/media/dikijarelituv.pdf In PDF document text
    • https://keongracun.org/contents/files/43088837153.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/vufopologux.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210910070932.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/25663701770.pdfIn PDF document text
    • https://aneri12.eu/res/file/vofapewubivozajile.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/13de8aa708fe6f37855f43b5753e0d48/21357005535.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/67357095172.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/lobodegawegofenas.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bixidaki.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/tiwituruf.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/fezubanosademojarogawesu.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/36084046471.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/lixaduxukidafuxabuxawa.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/20358642405.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/c7ee65d358f6fcab9be93b93bbd24ea3/wumixidojer.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/jelisotorelisimabem.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/44273030865.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135950b8701d---97270867598.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137c37090306---vigowidototolowusad.pdfIn PDF document text
    • http://thevalleytrader.com/files/mapevonevaniseteki.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/95841486017.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/rojifexafozoxu.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/gufugajopuru.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/50693983593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=lovi+video+maker+apk+downloadPDF link annotation
    • 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_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 10488 bytes
SHA-256: 7f001eda35c445579ed8cb7b6d33ca325713d472ef6d231e45a82b7153c4ca69
font_01_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 17808 bytes
SHA-256: efddde8cc9c878f86cf2de0b2a2aa5aa27e1fa84d13d0a1230b7215f9eb6fcb5
font_02_sfnt_off00012275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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