Malicious PDF — malware analysis report

Static analysis result for SHA-256 390ec47e089a0afd…

MALICIOUS

PDF

84.1 KB Created: 2021-06-26 00:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c29d45f7117bd5227c8a436c3c654fcb SHA-1: 3660aadd7fdeba0a79a61a6ad94264a7467f6306 SHA-256: 390ec47e089a0afdc4d289e5fab98adb6ae461d79b36d0a795617807ccc14308
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a second-stage payload via the numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://getadoc.in/ckfinder/userfiles/files/55193729252.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ad1748592---85342686026.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cc5e7ce28a239559ecdacd3076d2a17c/97707028436.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/lapovunadekotapexoxup.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/67099909143.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/degij.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/gazogoj.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210623_211054.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/92762015809.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/fc42c75c271647105a1c3de702ff4230/85490160709.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8ba93d3f9bb7f9e7c182ad6a51fa9b8a/sijuripu.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/2514971235.pdfIn PDF document text
    • http://kezmosas.hu/files/file/dunakaritowel.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/vipixaxikejarumujaf.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/jatojiduropizovorif.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/negizebawa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/69fr946ks1rv5tal0uj57ccth3/41319034189.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/jofaxomibitovuzezamoge.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998b5c8b8d2---tizevekapepupefaraba.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/fdbca9394e74e1ec221fdc5e8bcbc137/dagiwuvodeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=population+in+2000PDF 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_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 16616 bytes
SHA-256: 684331614e11f6dc9b452554252716663b9f2dba87b016af147e667724c9c96d
font_01_sfnt_off000114d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 10188 bytes
SHA-256: e00a96fb160756beb8c3c2f3f25110748c76444df574c9c64562d65799266dbf
font_02_sfnt_off00012bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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