Malicious PDF — malware analysis report

Static analysis result for SHA-256 6619be198c0acf97…

MALICIOUS

PDF

108.3 KB Created: 2021-07-18 07:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c2828c3fef5c2bdcd4c7755b579a4e22 SHA-1: b5a86d45836a1a2c47d82fef5c0dec5d1a5539a4 SHA-256: 6619be198c0acf97c5b502d86fd2f16f15d3083996fa307c2d614ebb95d42954
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9813

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://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ure84ejhvdbv2kl3plg63j7rf2/buketudirazesem.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kh7v47vsmopn5hi5itv2rktkl4/nojepoj.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0796f1a95---mawajidevunimosakagi.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/33485296939.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/iajln4arltbnh9pjphcqicm2sv/zasugakawodanudanulobi.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160711c9e954fb---kezomag.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/vitutuwatobexolin.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/de4d31b71e58ff84543615b480ff7c9e/17761314329.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/lopukatepev.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/7opa53l34onpqnu6s1h8kplelg/87686816059.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47b703a7c2---16287786685.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/mesabatelepebisogukevoveb.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/sexejagalag.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/eu018mul4kifclnj7fkk1085qb/37708837865.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/mirafuwujepo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26ddc60335---kekikariti.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0099ef1bf9---85046306966.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/10729153466.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/62580584552.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/4098fe5c27e381b9f4d1bf97de2c264a/majurotuvajifedulurazok.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6a289ac4---molawonafejumenupuz.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16084de04ab0ad---23916425398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=prestandard+and+commentary+for+the+seismic+rehabilitation+of+buildingsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 16936 bytes
SHA-256: d52475f0cc77f75021c823f7434bc0f8c7ae6f0944def4266721a37b132a586f
font_01_sfnt_off00013249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13249 1780 bytes
SHA-256: 95ce2b2c6bbc93a65c73b4e37c75259a0ef33b8643ea9972e37dd2c1d618c40b
font_02_sfnt_off00013aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAE 11276 bytes
SHA-256: e8733e0dddb08dac4d0f12b0d4465756529b6fb201e5ec431e7c3e2eb266ef20
font_03_sfnt_off000154ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154CA 19712 bytes
SHA-256: faf42d2169001746fef6fbeea079114f1fcb17526927ff37fcbcc26611a0b34f
font_04_sfnt_off00018721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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