Malicious PDF — malware analysis report

Static analysis result for SHA-256 576ecb8db4223149…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 05:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76144487bb7af604d4bab168067a6e3e SHA-1: f2a0d451308cce58bd34e0401d65268a624c0af7 SHA-256: 576ecb8db4223149dce26a4e02067f6f298d1946b5bb19261212fb484b2e9e16
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pecsikult.hu/files/file/50834807350.pdf In PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/tonowotekawoluno.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/9252190120.pdfIn PDF document text
    • https://hoongnau.com/upload/files/53070383653.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/kotetepowe.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210723_D32ACCE265E1D214.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610668f633f18---lagegaturekadufivunaxutaw.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/df0qdov9bpgjmqeda6q9aj1em8/rubagepuf.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081442871b78---73249518473.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/basigojozopudavatelasoze.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/8904447c73a5260b5b0e7e9958956580/wusorifukivejanes.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/112543908d955c15e2f1dfa18b7135a9/pujuwuletadeko.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/lilixotogu.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/9268097030.pdfIn PDF document text
    • http://acril.ru/ufiles/files/zugemetavarelirovafev.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/ruzaxoxogepanobakisuwuke.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/dobixis.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d533e646c4---7253631159.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c973d2adc28---bomabisavazijorovi.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/96877457080.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/jexasa.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210527235603145.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a36408650a6---46444566807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=piercing+pain+on+right+side+of+chestPDF 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_off0000da54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 17444 bytes
SHA-256: 0cb51a488d4a89154f226d161e2937be14f3d0e1200de0ea66f9e41966c9fffe
font_02_sfnt_off00011f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 10852 bytes
SHA-256: 386d9a698ca84edd64e2232051e83cb2a44dadab8887fc0d49e2cfa291864d55

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