Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c49aa0f8c4952c…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 02:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 798fca21c47e27620070ac7f5f54e7d6 SHA-1: 5432b7b821295d958e3ab47bb541628431813042 SHA-256: 26c49aa0f8c4952c272acc75ed8db80e2a9808f433d2ee8effcee90e55d9dd81
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and link farms, suggesting it's used to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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=remote+gsmedge+1+apk+2018 PDF link annotation
    • http://kingtonkatsu.com/uploads/files/zatakit.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/45439895453.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/6e656f77d083008aa7e92681c11b6a63/kogagabazinodojomik.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/72156394157.pdfIn PDF document text
    • https://kimansion.com/uploads/file/61635767609.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/62675300822.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/78859423731.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/957cab8547622062c3ba9b7959ff0e22/fivuzu.pdfIn PDF document text
    • https://simorgh.it/uploads/file/vajoluxuninojodaveg.pdfIn PDF document text
    • http://asvpp.fr/pdf/movedo.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/jekinewuxeni.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/livebekivudujeke.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/rewikisolelem.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219172336177535.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161373a63d2262---jikixa.pdfIn PDF document text
    • https://jck.ro/userfiles/file/gazatakenawafaz.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/pevevanifane.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/31972533383.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f2ee0f9a7335f43399162b9e68be2027/36128355625.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/11379181059.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/95037307212.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/27010420343.pdfIn PDF document text
    • https://durimawar.com/contents/files/81979501381.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/bomajusowurofusaze.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/57301510376.pdfIn PDF document text
    • https://sanagustin.cl/files/xemefegeve.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_off0000b55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD70 17428 bytes
SHA-256: 60773a38ff57957c07aeca227ddd0c24fdca7d8df202826676cf99ce6d826cf5
font_02_sfnt_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 11032 bytes
SHA-256: 123e7d1d073eb9ac413ffacee75b18ba4130707c44dd6fa5421028c1ba3b745a

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