Malicious PDF — malware analysis report

Static analysis result for SHA-256 258db2750ad992c8…

MALICIOUS

PDF

89.9 KB Created: 2021-07-05 21:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ef4dc6a197cc8be1da33fe6a2a233e0 SHA-1: 394478ee2665ae839dca20580a3c9860cf4aef0a SHA-256: 258db2750ad992c8aca7a4ce2e039165585706e208106b9c8b9974ce88ba4ae2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics strongly suggest this document is a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://huntic.ru/uplcv?utm_term=cold+front+waterfowl
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077120f6322e---57068846033.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1379e8a2b---27576379533.pdf
    • https://bloomland.com/sites/bloomland.com/files/80944628863.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e130e43bc---rujeraxarujo.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f8e49db63---63589958069.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf05923fe6---dutupilogurebakuda.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2e3d1f1a4e43374e5d3b614d16b00d6a/93785442037.pdf
    • https://hsse.cl/files/34838199423.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54779968387.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f019f1a0ef---xewalenamunew.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074815f85941---mativavadikogubosetidifa.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3f784dcc---39243009070.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071416c80859---sufifapewudunavazalenowaj.pdf
    • https://gamaconsultores.cl/upload/file/lajupudumefugafabejomabig.pdf
    • http://phongthuydotho.vn/upload/files/6054458578.pdf
    • http://jncs.kr/page_data/file/20210704222706.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/bamitu.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/5baff86d361f3ab52a238f23b17034d5/11098814766.pdf
    • http://youngshiny.com/userfiles/file/1622680245.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1429926f3b---zodifidipowanuparad.pdf
    • http://dahchen.tw/userfiles/file/korikaxelujoxasisiv.pdf
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/fexovawusam.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/93e611a70082c20ee2d69b6e00bcd289/japefumu.pdf
    • http://yossy.biz/userfiles/file/miforowulelodojujada.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 16792 bytes
font_01_sfnt_off0000fe0a.bin
86f88fffb81246bbe49b158f518e6572b7d1cb87930620420ad0404fd2215125		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 10204 bytes
font_02_sfnt_off00011519.bin
66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 16544 bytes
font_03_sfnt_off00012bd8.bin
02f8745be9eb11172f4b0e54eb540d7eb7661f5110bd30133c15039163796c5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD8 17152 bytes

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