Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ac7d856f7eea02…

MALICIOUS

PDF

106.0 KB Created: 2021-08-14 14:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 311dbd36562afe1d64d56d52cb4313e4 SHA-1: 4c9b2c1e4d2c0fe19437a40e55907b150977defe SHA-256: c5ac7d856f7eea0234419d3284640671dcb75ba949b73f80061f5539ff4d109d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised CMS platforms. This suggests an attempt to lure users to potentially malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://afgventuregroup.com/cfiles/file/79243028311.pdf In PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/25ae8d211d0ea7e5cff97f594ad71f7b/wolinawodasokoxiwapak.pdfIn PDF document text
    • https://majubesar.info/contents//files/16137458646.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/ragubazikixigifudekoted.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/gedunubulidu.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/suziritutibavexipudap.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bejf0u2qu1i14stt1h4pibocpq/rojijezinofagumu.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5jqe3f4l8qu775sh5f9g0gge1s/72991309181.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/riwiludebuvadaduwixexeso.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeb81a2693---lidawuzuzaz.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6db998c07---95075070084.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/vuwaxobedimipisanojunupuz.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d21b563ebfe---famobebidazinav.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/09f82317dcafc88812f647cb68d8e08b/45857624320.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a92b56f274---vavowavoroxatinozego.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dc74849c6---basoxu.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/68599247044.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9802f050f5---sudinizuzoxugida.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5e3bc6d971313e257405487a80bdb515/mulababajonowazexegir.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/nugerijufadefab.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b67a6bc9c---wosugasivew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=are+state+parks+free+to+campPDF 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_off00011ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED9 10472 bytes
SHA-256: 9f2785a72f005d9bfc2223d5327dbb5b910ea33f1626c80b416e07555010ec17
font_01_sfnt_off000136c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C4 17840 bytes
SHA-256: eec1b88e218139406d3ad2f8ee47b087c8707c0e6ce27095c2125a6608558915
font_02_sfnt_off00016593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DA4 17500 bytes
SHA-256: 90aa303d608fc7c55347fd13e77776c85ee08bc9fb4d9ceac0e96e3af8ef9a0e

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