Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b02eebce845573…

MALICIOUS

PDF

86.7 KB Created: 2021-07-05 12:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 447faa9db9be8a4c80c9cdbe125b1e6a SHA-1: 9db9b87ede66b4d519b04e87652da39e0a28827f SHA-256: c0b02eebce845573dc158335f129ffdde97e2ccf614709b265987364dd504167
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous external links, many of which point to PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it acts as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=megalovania+simple+notes PDF link annotation
    • http://kssi.ir/public/userfiles/file/78037473118.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de3aca2483---67687550212.pdfIn PDF document text
    • https://digireg.cz/upload/gavidixafizusebikiwi.pdfIn PDF document text
    • http://minhanh.com/files/wuxupi.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/friguqkhgq89ic80mai4q58ej5/vafaf.pdfIn PDF document text
    • http://sbkf.org/files/files/34727258392.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/20936737693.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c9e716e201fc3baa84a14a4f67c1a29/94906370750.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/93547564857.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8344011e0746b3b878c5265c816fbec0/98610172575.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071996dc02ad---segemekedezu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60dad8904a---tixinanifatomitonuj.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/91395099017.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3ef24a9cd---45824573142.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/94d739bb81d1e9fe45eaabf318f3f8e0/26894025216.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021060808574470554.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/64437824842.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/nuxamuwevaxifaj.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/1650706252.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dc0cc6530cc6bf6d47874fae27e0b79b/vojola.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b831ad957d---54227024011.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/77824821441.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3v4e445pduvaaadjbbbtac3rc5/99770402556.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/98923683873.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_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 17664 bytes
SHA-256: 5e51027ac00596236c52116826a029edd366989093727db43ec2fa962fab8727
font_01_sfnt_off00011e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9A 10552 bytes
SHA-256: 1882380c80e124af1e1c7f7ea23aefef1f137365aa7a15396dd0ab9a0251ac1f
font_02_sfnt_off000136b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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