Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a21a7cfa9f55e5…

MALICIOUS

PDF

90.0 KB Created: 2021-08-08 11:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d03de453de2b7c7236c8d910adb7344 SHA-1: 76cbd1556e753c0fc91b84b7f05fac66437f560c SHA-256: 91a21a7cfa9f55e581f38af458b30e6845f41a9553d427b5033a66709720682a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript further supports its role as a potential delivery mechanism for phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/95577017697.pdf In PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/42901398365.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/rj0vif8ldva444eu8lr4jga3o3/38476502969.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079428b89293---degojesikezafuguzel.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/36065966003.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/ladefefuvel.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/nazalepewesomuzatatelusek.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/16970212486.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160917da7c2678---renomamarawagusiguwelagi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0ef79c620---vutoninedaxawak.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/bizemekakukibuxidezin.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e3ee20dab---vapaf.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/74308315022.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/243c8746r9vjqjbilbkr1rci9e/18339018235.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/69666857732.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ef0b58267---gezomafulisonale.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/21827403595.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/badovuduxonewawereseve.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/josibepibafe.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/fibeferodobij.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8f0c405ff5f84760d66d81b0e8c194f1/xenaduzemabaguv.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/55800722115.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/25028184676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=la+lengua+de+las+mariposas+full+movie+english+subtitlesPDF 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_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 11208 bytes
SHA-256: ceb39f695c5d5777aa9e1d90ec4d3337ff06b7dcb0f257ac29a41daee13c0561
font_02_sfnt_off000127eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EB 19676 bytes
SHA-256: dbbc7666a6b144146a018e958b60be7f2958606b5051826a96c54752a128e0ef

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