Malicious PDF — malware analysis report

Static analysis result for SHA-256 0509efda5ee6b618…

MALICIOUS

PDF

109.3 KB Created: 2021-10-15 01:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9ae04f382ef497f658ffaf2b663d0dba SHA-1: 2e6c17dcb8dfe2ed0241c2172a5b48d4acb2f701 SHA-256: 0509efda5ee6b618830a05e63f00067ce299db4a082e850fdce5a2f328e85ac4
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting an attempt to lure victims through SEO manipulation or by hosting on less reputable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://burragebrothers.com/demo/jolie/beta/userfiles/files/5303702510.pdf In PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/bf0080a4d2b386318b2d972c969ab8cb/72779874822.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/dezokanugaxidiwabuxe.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16155dc22b1dc2---lanuloxejuwar.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d225a763---rarigatudodinutibeworuli.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/28337060193.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/nofevozok.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16167e990f1694---64252988739.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/14662552321.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/sotuvoze.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/dejesosemezanose.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/wurajugujigovivenofomoduw.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/94756564878.pdfIn PDF document text
    • https://alibaba-cave.com/userfiles/file/sekoweri.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/33344648635.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/tavozaretakaj.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/nozeganazazawixux.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/82067637141.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/wijivoxo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4a74f2353c138b1717793bf9328b8d73/buronumuwizid.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/1116043855.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/gosota.pdfIn PDF document text
    • http://etnorom.hu/pictures/koxuv.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/savomoze.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2a7190f0---36298233429.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/tudatanepavazopefojubuxif.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/u-9XGpgKpwY/uplcv?utm_term=economic+and+political+powerPDF 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_off000146be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BE 18668 bytes
SHA-256: 5a82dcde1dce375e5722fa835bcaf1e232efeea98db51179b2a583ff22055cc0
font_01_sfnt_off00017743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F5A 10576 bytes
SHA-256: 70968c6c53ec0af1f902e4cc2f1affb00ef6177be60816cecadefc94e6299667

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