Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d49722d1be5bf8…

MALICIOUS

PDF

80.7 KB Created: 2021-08-11 22:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cf6020c4f0996a584e4145a5cd10d417 SHA-1: 061cf543eacf69689fb39e7d845513ff68edd8c1 SHA-256: 78d49722d1be5bf800005cd5fc90ef49b7c3387d26de7d39fa9e28c8b95cfe55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to download further malware or visit phishing sites. No scripts were extracted, but the structure and URL patterns are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://petala.gr/userfiles/file/jewuraleli.pdf In PDF document text
    • http://ji-tien.com/userfiles/file/nexojijikimafujal.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/jesuguwojalikefizajufazo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f278fa05640---98486066397.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/vikolup.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f37ebc314ce---pidakulanus.pdfIn PDF document text
    • http://cy2hand.com/userfiles/29587855267.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c33a826f1fb---79610086937.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aca6830e9c5---25463037261.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/61532177857.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/30689307377.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b60c665fa3---kidekuxixemupakuw.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9e26b4f0---20391468145.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8eb424c2---pupubamux.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fafvp3q9dq4u4cnp0im97tq05/kugux.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa4726a6a---80728190458.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/ragiko.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/jipokiwa.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/pazaxixemotekazanexibez.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/zatufoxovevuduxivazeja.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858486dfce8---11635095016.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d27c36cb2af---bagajowubufewowufidu.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/93833856177.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9c73b4250---73999057398.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/sowuwudumanatopaxa.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/rodebapepiwubif.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/65790762046.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/19760605295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=carrom+disc+pool+mod+apk+5.0.3PDF 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_off0000d6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 10960 bytes
SHA-256: bfc3b6669bf7316b71f921f60a2d48a806507d252accce559f9d4bc746ca25ba
font_01_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 16952 bytes
SHA-256: 9a2db7daa16b5954a7aced75ff6722ff03a1ff3487964b2892966afe370d2733
font_02_sfnt_off00011c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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