Malicious PDF — malware analysis report

Static analysis result for SHA-256 6baa5c8b6aa03377…

MALICIOUS

PDF

73.0 KB Created: 2021-09-16 11:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a3dd0f7dc95106ca94beea912435af7 SHA-1: 33b49e0c72c87091c83bbb5ecb2b1ec28bebc1a1 SHA-256: 6baa5c8b6aa03377d8116ed3a74aad0c3546caed6ad4b1668d76a107a647ffa3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to a phishing campaign or the distribution of a second-stage payload via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=coc+hack+unlimited+troops PDF link annotation
    • http://hzbmsj.com/images/upload/File/34984625725.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/16896918653.pdfIn PDF document text
    • https://rosycaffe.com/file/kimeruvuso.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/15310330895.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/scjuuk1pdr8g5oilmjvsj28ga2/24447142878.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109050850456194.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/49567997243.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/11a1fbed9c834e44a0a6782a1519e25b/34833246340.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/tosar.pdfIn PDF document text
    • http://juncheng.tw/upload/files/96626649990.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/95436660322.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd33260f0f---15780774298.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/11270125187.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/jefalivi.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/54833384925.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///24202754684.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/vativerejobokomefunob.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109061633316386.pdfIn PDF document text
    • https://hojoairport.com/images/file/91459226552.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39318a6ff---melurekekurexupofemu.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/71053139824.pdfIn PDF document text
    • http://888chji.com/userfiles/files/nulikezatufudusolubifu.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0uokdlnsfiemsn0lf43d32r7of/38553187363.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130e606c9fcc---20891008065.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_off0000bb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD378 16340 bytes
SHA-256: 872b98c6e2b7ee8b8bab24627ee25cfd3a5b223d065a53b506193bdddd36a392
font_02_sfnt_off0000fd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD29 11000 bytes
SHA-256: 8a1e4a73cbee0047b5fdbbed0da238991bd06b2d5390ed9087746960dd776710

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