Malicious PDF — malware analysis report

Static analysis result for SHA-256 84335bd97d5bd27e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 17:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b71c8dddd8d8e437dd30c03c1afc5445 SHA-1: 49d8adb1362b97389f3227017d5da49ce7bfd813 SHA-256: 84335bd97d5bd27ee113e8cdf5df952d0fe02dc8c9a7858ff8b487d56364d0a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript, a common technique for executing malicious code within PDFs. The heuristics indicate that the PDF acts as a link farm, directing users to multiple compromised or disposable hosting sites, likely to host phishing content or download further malware. The presence of embedded JavaScript strongly suggests an attempt to execute code, likely to facilitate redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://davcpundri.com/css/file/1007546866.pdf In PDF document text
    • http://globalcentral.net/contentupload/fckeditorUploads/organization_/file/38065086598.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/zezexozadaluredimizota.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/97038583690.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/58765633612.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466102ebacc---bifagusifazedufeg.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210902_183234.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/16425898565.pdfIn PDF document text
    • http://paliukenas.lt/i/File/xonuzibujoveru.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/gebidupupave.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/vavetoxasugenekipazafudug.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/kedutufitevugedavuva.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f07d75487e---5504984967.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/zunexijet.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/wekajezunuxod.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/22098543302.pdfIn PDF document text
    • http://195exim.com/datas/files/mopiga.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/fazupunat.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/gizazunogonozaxuz.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/wexexanowolejavul.pdfIn PDF document text
    • http://gibisch.org/files/files/fowogezivu.pdfIn PDF document text
    • https://mackbeks.com/files/file/71898196588.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/bupebomo.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/35250124210.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/sigilemibarariverefoku.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5a629a90e---powurisuxejoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=skam+italia+season+3+episode+2PDF 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_off0000b51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 15528 bytes
SHA-256: 5ad0126ec9f076d23e185b9f517b8a7be1b8aa92a83d0d5bbf47a6151da4c6ea
font_02_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 10912 bytes
SHA-256: 22584824da15bcd777fea782ea8a03b9e42365b18d3b8a53c4501d7536cd6769

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