Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6145d4b1cacf4a…

MALICIOUS

PDF

106.8 KB Created: 2021-07-03 03:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 60bd3efc29870f6b257418a391f85684 SHA-1: 77eeb56fecf0e6223ded1bd9879f42eea4abea50 SHA-256: bc6145d4b1cacf4a28de2f3dbc5f1ea4e2ba7e89a2e2c76b8fe986554d66c9e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/polulitepafokopezosu.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768ada09a9a---legomuk.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cf911a56b3c---berapoxumanux.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f48e23640f---vidijana.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vhgo2oot2lbsvop7153lm94nqv/75041343348.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/sim0507ghrnt2t2akhkh51qi3k/7555876633.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4878dfab1c6c2e54b67da051ab7e181e/32692174691.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/sukikutigedajedosi.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dlc0oi1vpspvo18nms4jg5t1t4/62478429159.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/beindffg2sglpe731vu9cb29c5/82801490218.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/nekagefe.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9b1a8b20e28562696e35692d88c434d2/xuniverabuvere.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/selasur.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/8956d7c20431f562d1390b35b3fe2bf5/ravoni.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c7137ec84---vebaliketidutedu.pdfIn PDF document text
    • http://www.centralperdana.com/file/27229685750.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075a51690523---rovapisitu.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/zajulinukijodonomiripefax.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47af2eac24---68060986437.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5a8864931---nejexebovuroganufibalif.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/matumi.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/vezuzubaxidit.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/suxutem.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae317cadec6---85428659655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=interview+questions+on+java+for+freshers+with+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 19080 bytes
SHA-256: 760d9393fa1ac95de71db81a77dba99fc51ed71de0aeaeb18e89759a628f4259
font_01_sfnt_off000155a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A5 16428 bytes
SHA-256: 23191a20989a09959b2cbcbcedb805b598ca26499a9d836ac043174a76a4ddba
font_02_sfnt_off00016c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C03 10744 bytes
SHA-256: 58f0a1be5f6cb51c0d1da056d8bd1aa285349dafd277415ddb6f12777671d4b9
font_03_sfnt_off000184bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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