Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87a63e2723b98a2…

MALICIOUS

PDF

77.2 KB Created: 2021-08-25 00:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a53472e48405a5a06cb43a5bf135f19 SHA-1: 053621db6f79a6e017d872a0a19116e7694a8a09 SHA-256: a87a63e2723b98a2ad35ad564878260601b5bc3f854bf5dc30f788c892a0ed42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure points towards a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://chcial.ru/uplcv?utm_term=10000+rmb+to+idr PDF link annotation
    • http://saikunghouse.hk/userfiles/55972911405.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/54136880510.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/99017502970.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ffdd4fe6cd7b96e4a4369a66b90fe78b/rabiwibim.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/86pamkd08bo65jbo3fjb6cb6d1/83793513852.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/susabenetogatu.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/80855565350.pdfIn PDF document text
    • http://jarosi.hu/files/file/rarewakedixujakesode.pdfIn PDF document text
    • http://www.bash.cl/media/file/nuwodisagesokotanisovosov.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/21840891811.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/wawotizameku.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/jiferugepijorik.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f877173bc---760145034.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/92889765297.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff0e7981eb---xikorefugidevizufuma.pdfIn PDF document text
    • https://emenu.hu/editor_up/5136617223.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161050f652fc48---zaxukekasewoselew.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8aa7c34ec---naxebeputewezonaf.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab99b4ef2ae---woxiv.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/parebimosapoli.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/gibukakepugujemu.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/lumugosufikosedidewupuk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AD 16008 bytes
SHA-256: 15eec1af6a5f9fb6f5b5375c671048cb4a8a7791e8e5704b58e779354dd6b064
font_01_sfnt_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 2348 bytes
SHA-256: 366ab02595a4b9cd9ab5c0327880d468a022638b17b4382415957a94b35dbccc
font_03_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 10012 bytes
SHA-256: 1313dc92276b17fe16ae70e7177494b46439e3eb0d96a06521303708d711bd35

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