Malicious PDF — malware analysis report

Static analysis result for SHA-256 488425d77c2cf51a…

MALICIOUS

PDF

101.8 KB Created: 2021-06-30 19:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 959f1e660cea4917630079bb083174b2 SHA-1: 2cbd3195f98f0e4a1f07de3ea01ef953bb946095 SHA-256: 488425d77c2cf51a61846b22206faad3ca00c4aa6edfcd9bf3f26101bedfb228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to phishing or malware-hosting sites. The presence of external URIs and the nature of the links indicate a likely spearphishing attachment used to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://synerhu.ru/uplcv?utm_term=use+of+numerical+analysis PDF link annotation
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/dc26cb77b9722ca66ee2465d135ee795/jezunonimuxegivazesujefab.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86e33042a---bukajoxubojelu.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/29143267562.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/kiwuzotozopizid.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609211f7ba0eb---43089215931.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608219a7278f5---80465293705.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/430d027e25ca3a9af433761b0287b2db/63225317020.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ea239cbaf7187775eafb0da6d5bd3ce1/3912891474.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/xewobugugafogilipiko.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/318997744d5e49c37d15c87770b1ac1b/peketeveligusilabateg.pdfIn PDF document text
    • http://www.bash.cl/media/file/40632174634.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caba0502746---momowawuribulafurisi.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/wemaven.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/bamatuvewitunolo.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/18824323489.pdfIn PDF document text
    • https://artbynela.com/uploads/file/40216327020.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795cfcaef83---94324727015.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/t25om79fmtipvu6uhfukcjouih/2149876211.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/11652359376.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea53b63c11---riwudisigojos.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/bivolaxamefisotalubijige.pdfIn PDF document text
    • https://goldenapp.net/file/xezimazupowabakud.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ksjnbr2tu2idbp0cv5h993jnk2/4357320232.pdfIn PDF document text
    • 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_off0001258c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9E 19332 bytes
SHA-256: 3a0b4c0553d69a3ff066e7470a9e0bc235b790f1459c13de39ad37670484bf00
font_02_sfnt_off00017066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17066 10620 bytes
SHA-256: cf4daac4a74e451a6b75d0ddfc77238d16e1fb6c795e239b9b2490165d42b99e

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