Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b436e0db0efb62…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 08:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52ad18d7c8e824d75531b3836e61afdc SHA-1: 0f8a21618328db2c022811f7c0490d5747521e3d SHA-256: c6b436e0db0efb627559ec12fdbf1e91160138c5726c58fc70af2a049f7f97a6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host malicious content or facilitate phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161401a9b95829---futexomo.pdf In PDF document text
    • https://phr4u.com/files/kuzezoduvewoxu.pdfIn PDF document text
    • https://network-italia.it/file/8149358821.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad70bdf070---95699300763.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-5/20210905161258304219.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/jafulexofijuxanexulaxopu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613870efc8c25---22245011176.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/daxuzelibeviloj.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/torigunit.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/29533253325.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/lanesibafetug.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133644abd4a6---62440600853.pdfIn PDF document text
    • http://opsir.eu/files/file/givukewegagelowesumesowoz.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/48915344507.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/zawulepejopigofe.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/moburizivibezakixopoxif.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/de91bfa8d557c624f4550d84fcd183a0/76955242798.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/83316266346.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/kepomiw.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/tetarepusogibixasol.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/gusaxeta.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/pubewubesisobelerapobufo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f846fc8931---vububimusefola.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/novilutavifekepe.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/50670149101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=highest+ranked+australian+tennis+playerPDF 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_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 10848 bytes
SHA-256: 5363c38c5933b5322f4a9e0d7dec5b39f1a1a6f047df407de7d1a4c9d1c51f24
font_01_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 16940 bytes
SHA-256: e92265432940e3fe6987dcf4a128abd4a691ae31cbf4bf51adf7f8d5be6d5299
font_02_sfnt_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.