Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ce18f639f01404…

MALICIOUS

PDF

90.3 KB Created: 2021-07-31 12:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f78feff250374c305820aecea6de30cb SHA-1: d80892a6b61528c858806ab3f8102af747f90b7e SHA-256: 02ce18f639f01404ffbd521f0fdd0552aa40323071bf5b84f375b5f96bdc5f92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the PDF is part of a link farm designed to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://krisoc.ru/uplcv?utm_term=50+tons+de+cinza+filme+completo+assistir+online PDF link annotation
    • https://avonsteel.com/UserFiles/file/kiludef.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/93411394024.pdfIn PDF document text
    • http://dietmoitangoc68.com/upload/files/fesiz.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/xanikuzirozaragipamowozi.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/52869794265.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/4u6klt4qik3lnpb73jsoi38mq3/gosuruwozenimakaxi.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/vamesokuzes.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/fanukeliv.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/pufatodekegetoderaditibe.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160763cbbee8ef---rukujafekuzavix.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/47773421477.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/78144130231.pdfIn PDF document text
    • https://gilbertems.com/videos/file/jasebuleweponi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1qh0qb3i7rciq19c1454u6uekf/lapivakiremo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608d18ac04592---luxeje.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f69bdf2b123---sitikajojug.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/afq99lrbsnj853o74qg6h90116/wezepujopuxifamozam.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a05640a53d---4439874771.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/762f0b836406b8dd78024a2d80886be6/dinewokeren.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/38409729312.pdfIn PDF document text
    • https://wagaskar.com/media/rexividapozizixilu.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e5281ffd9f5ddde8f5485544c77f638c/76141172009.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/72a742d85d7305f4a70ee73dfab02393/91510177609.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baad55a1ca---pebanubovevemu.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/79419245717.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_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 11000 bytes
SHA-256: 04331113404e728670e7acfd78090f39a1abf37704c1efbf412b4a8a2a26b464
font_01_sfnt_off00010f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 20016 bytes
SHA-256: 76d2ed2cfee0dbd9a4f7f4358c1d4cb6ebd76445d2fd08efa1186087b3101df6
font_02_sfnt_off0001400c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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