Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3edd80d3177ca75…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 11:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10b5e2e7fd2f84461c5bd2c17381f452 SHA-1: b4bb7c3d1ae23793e3e208b2dbede8d1a231481d SHA-256: e3edd80d3177ca75c7d92719c66e7b9ea799081a36e8580bbc1b62eae35987f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites, many of which are hosted on compromised WordPress installations. This structure suggests the PDF is designed to act as a link farm, potentially leading users to phishing sites or facilitating the download of further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=timer+omron+h3cr+manual PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r43o8vfnqj0ie3g08dncg1scic/95578435919.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/8b6fb668cea57eae2c986f008c9aab8b/15291156084.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qfvaj0sk0837a4gg0q0ib7q10a/jivinatovot.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0dac900dc---47709085494.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/lupubeze.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/53994409540.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/bcue971k80o4duvv04km0l9hi6/28691524756.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/90290416997.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/30124224347.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/suluwapapufuda.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/duxebeza.pdfIn PDF document text
    • http://cichanski.com/Upload/file/597456355.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/xuvarupamivixovutegatefa.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce8b983ad8---26164703541.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb25d5606---85169398976.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160809e2c6ae26---17784551657.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/93879685005.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/c563b7d6a575d9e2581275192c84da2c/zalowekibafaliv.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edef63d4d43---banijetidikuvexitukageget.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/nodajazibasisumiduvaluvid.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/72336757041.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_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 18236 bytes
SHA-256: 4da2c1127fe20df7f6b24864169d29b3d90b226f62af05408cabb461d8b56f10
font_02_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 10464 bytes
SHA-256: 4af05f1c0ab931a988fd60f7716e781646170e87c53f9a4074fd571e3cfcd677

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