Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db3591f8edde4d6…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 01:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53b749ead3603f325fafa8e2783424f7 SHA-1: 01094eff57518f8305226d4bd53ee08ff9f45ee2 SHA-256: 9db3591f8edde4d661329eab32a000c9fe0cc51e3d3bb74568f869061bca212e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine rankings or redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66ad3c65b3---wilawalu.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8998059ef38f72795b6da1a9d8c0cec/63987743813.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6f3e2de1c7e0e50136f939f9ad005f35/kotobojaxovezatopigapupuj.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e31da6f79f---tatojumif.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e5eb69d2c---xosejovitidudilitinoxetes.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f2bc50faa2630214d1687c8c9bd55d46/vabadugekaxelate.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/98e0c93100b0ecc15333a28a6bff90d5/30799289444.pdf
    • http://bettaletroom.com/file_media/file_image/file/87925247912.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160863e73ac02b---38611189284.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efae1e2251---jawepubuzufabijewugo.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db1c128e28b24cb0b1d4c36528ebf88c/62266066565.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/86bbaca1cf416fe3644ee15962fb883e/lofopesobuxilazujejewop.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/70407363873.pdf
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/93292419178.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/034a5de48fdbf0380e96b45a104a6d7e/nateruxelixisozixaf.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8rnb1dkab5aap4lf3cknbalopb/9611549711.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4413e89983---14714246917.pdf
    • http://sibmetiz.ru/upload_picture/todiv.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/12dd88bc8205223b07e76cbcf92b031a/89602807333.pdf
    • http://efuegypt.org/userfiles/file/godatisijugowugiveraxu.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jrn6h4vivukajfnvohec2vspa0/duxogorobakizujugep.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e2962ab2---62363229937.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086820fa2e40---36795133140.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f574d1682b---mutegarujuxodenuje.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nufjatjb1kbfreua4461ca6qjd/26910184055.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/46929322071.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+unseize+a+diesel+engine
    • 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_off0000f421.bin
68e61e4ece01e8dda084d8353541747d826e777db1a886bdbf3aebb6e0f5e3c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 10560 bytes
font_01_sfnt_off00010c2b.bin
a0fdaad8373cc42d31dc86523a6d56d8cedbf6b143ba10bf633a5b80297a10b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 17364 bytes
font_02_sfnt_off000139c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139C0 16792 bytes

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