Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e97db8208531ae3…

MALICIOUS

PDF

92.9 KB Created: 2021-07-13 15:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 602d725f4759e177497ec5032c3c92a1 SHA-1: eaf438ee40c3b3d3ec4e4948aaeb599265526f80 SHA-256: 8e97db8208531ae3bc38bad3a8d35226d55d09e2d2e5413752ba2262e525061c
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • 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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b5598eb3e---21919977083.pdf In PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/molobenetagilakof.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105070932162952.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7274854db8---39460147793.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/40018931814.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/fuvajupisivinebij.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/19902079123.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/svi4nk2son3fal31um326mfk5p/62227924488.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa17bd679cf---30899977360.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4c397c991---marerosudepagu.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3f8b641b0a492e73848490d1ec605dc7/jupileburovomazad.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/p6tj2iraqtfnjap1suvl9u7ol3/vekume.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/sonerolejobuwuwara.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4a08c0117---24376165344.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/d4m0e63ueleccvrtcm4chvevi5/xupefitiwuguloko.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/jakemunobek.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5aabd5bff---bojeviredisazo.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/satipexesireko.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/86e3735d6bd0d174823ef7f6d43adf6f/91365956447.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608331fec00e2---26864266087.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/nadomivuzusowari.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1623419565.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/25644669090.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/6682845bf695018f839a7a58aa297970/dexijufezujixebabi.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/dabutudiwotisibazulaget.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=foreign+exchange+rate+project+pdfPDF 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_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 10896 bytes
SHA-256: fd5433f4f698dbf124f359d0e4f97f81ce932f149a9c23474c2ff8ffdbd228b1
font_01_sfnt_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 17348 bytes
SHA-256: 3245242b0aa4880eaca030d47d7f1c22afe9638f5d4793691717c0a9d2280292
font_02_sfnt_off00014e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1