Malicious PDF — malware analysis report

Static analysis result for SHA-256 4060f24f7a28ad95…

MALICIOUS

PDF

72.9 KB Created: 2021-06-28 23:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ed4b323449936d3c964aef93f3d6a62a SHA-1: f05b11b0d5035543b8ad258e3681a939ed208b85 SHA-256: 4060f24f7a28ad953e99559097cff8b504aa58acddfcaad715a3bb711a6c816a
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file likely serves as a lure to direct users to these compromised hosts, which may then serve further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=an+electric+discharge PDF link annotation
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba306439a---xipodolizu.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/40e833552916edaea8382623c80a8e04/garupamapowitaputi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608365aa2af6d---14001144.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/62e02f52adae4f6431c6dd799dfb7c46/16976296360.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210613145905.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/12827219983.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/sapokinipugurakuwal.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/jodud.pdfIn PDF document text
    • http://skupka23.ru/upload/m/xasisufalesutadavi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce5ae685f---53534512774.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/zovevimawulafesujoguwokik.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc698bedb8---32418547072.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9edd17c8a---sidasobibale.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/xegumuzebalumus.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/26224919806.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c059dd95f48---padirewamo.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/juzugufidano.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947b1110d07---42985528682.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/luwizuwadanusumitugibe.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/68889738584.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160706b32292f6---gibedelisedetilomofaba.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/xejegivirekigi.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/mudepuxinagujikiso.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/qaskh9sgt1b8at6boia801sl7u/38094633478.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_off0000bd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 15700 bytes
SHA-256: e3e25c1d290f2d6101f848641d38bc111a9f9ed4b0aba8963e2436b5904ebe51
font_02_sfnt_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 10508 bytes
SHA-256: f551b53e4cd7640d51984ef6f1ecd1e42eaef74873fd418e2c68e1abf70cde2d

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