Malicious PDF — malware analysis report

Static analysis result for SHA-256 752da4be2e825a1b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 21:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c87bea98ff1de19a36b6cdbec4814fef SHA-1: ba555cd2d699b5fa495082364c281d5b43129c98 SHA-256: 752da4be2e825a1bb7d8e65242d98d2b5938ad43f867beebb74088f686d2a616
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aotwresort.info/ckfinder/userfiles/files/vuzovuwojamovugoritibiro.pdf In PDF document text
    • http://lws-realestate.com/userfiles/files/bekenukos.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/55221980942.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/16111349712.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/32260012519.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/69941510809.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/funaru.pdfIn PDF document text
    • http://chipgene.com/image/files/20210726_062946.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/d7ee35ca6ea77f18306b6cc7df6645af/kuzaroveb.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/b475ead1f49c657e2fff28c3cc223c89/rolovirukapakupaw.pdfIn PDF document text
    • http://stonebreaker.at/zirilazivafodonupep.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ro4otlied1l730ovn0d30v1tum/6444657207.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/28854075375.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/nananetopuzum.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/zetogowexuxobogujosokige.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/14362986000.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/48528255134.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d07f2bfd961d0b5679e4bb662ac4980a/darijid.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/jonovodizopizo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ae693f6a363---mesinujuwoki.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ba433269---monawivexajomamutomepejal.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/juren.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/0ebvcisgd19cuut259feq5qnlj/vuvalilosil.pdfIn PDF document text
    • https://filetorme.com/upload/files/kedagumusejapuxosezilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+unsend+all+messages+in+instagramPDF 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_off0000d701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 10768 bytes
SHA-256: 9bf44f0829f11bd4742534bc1d95f34e6674e82239137f47f375aaaea08a62c1
font_01_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 20388 bytes
SHA-256: 3b7633d93e5f50d4a53f06eaa5bc94a07eda5fe4935f7e7deb0fbcb770a07058
font_02_sfnt_off00012421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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