Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e9024d5731a260…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 14:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 07565ab3ad828c19aab162638a9f2287 SHA-1: 60107bf46044eb8a5156d16c083a0b379613a39e SHA-256: 52e9024d5731a260410fdfa80f589a1bfe0c303fdeef862a121ff43ec0787514
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, with a high ML score. It contains a link farm pointing to compromised CMS upload storage, suggesting it's designed to distribute further malicious content. The presence of numerous unknown URLs hosted on various domains indicates a broad attempt to redirect users to potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161120f5adc877---46238678585.pdf In PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d65b94fecec7bf4c51b9e8c3805640c2/wenavinije.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/kuluxoxa.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/e6a7e8cba277c5820556480a6ee5c3d7/liputuv.pdfIn PDF document text
    • http://arslanemlak.com/E/file/21054517860.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b214a38ce4---pilinili.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a318620535aa8c8515c2894fc2ad8161/8127945997.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/64945219017.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b56f3ae62c2---34949297549.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/92150865612.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/ruzerurivema.pdfIn PDF document text
    • http://homeopathyhk.com/files/68134235439.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7c1ea54e---jodoxapunumako.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e5d1dd9c---zimuxujajolomukitota.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c936b42ff---kisewisoketadalob.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab995a99b5c---98396415774.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/bolir.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a9f9675b2e0---lugekijege.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/8902300475.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/5f351a4116fe91c08d149a89c2de1337/1843508254.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a300efe15---29931480036.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/badiwabezedemafupavosenun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bible+in+kannada+pdf+downloadPDF 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_off0000ca9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9F 10496 bytes
SHA-256: 7c982402b22e31393b70335f4f24f76cb5c10dcd764fc2cc7e3616ee8d78256a
font_01_sfnt_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 18272 bytes
SHA-256: 4036f01bf39b53e9b5f87b2b1b452d0fe865bba64cc9e9f0599fd3a07b85e6ba
font_02_sfnt_off00011110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1