Malicious PDF — malware analysis report

Static analysis result for SHA-256 125d7c2d51aaa64d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 19:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 91c8cea317c63d77550ecc722a89f7e8 SHA-1: 897506a53ceacffc26e7fade24c8882b057fda6b SHA-256: 125d7c2d51aaa64d2080a7a4e14032853bc6fd5e5cbb85575825eacf1b92ce8c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised infrastructure to host malicious files or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://muzycznescyzoryki.pl/userfiles/file/tojokeremuvud.pdf In PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-13/20210913193359702953.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/74770149797.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d14d0a25---betutubur.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/14386892139.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ad307777127c1f4d99e10ec2e6f58b69/75972918947.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/66877684126.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/37821728462.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/7718608081.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/69009110897.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/vogikojanovedavozuvo.pdfIn PDF document text
    • https://pmms-online.com/assets/file/48915415338.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613894a8b4f60---rasosutulu.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/60469783644.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/vexexevagolimulubijojepek.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb8fdd2754---87790867103.pdfIn PDF document text
    • https://negaratoto.com/contents/files/760758007.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161365e2cdf663---loxanebagixizijevufis.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090615040136.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/78143979582.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210909150824.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/jokubi.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/75393323705.pdfIn PDF document text
    • https://ferropula.hr/files/wosadizofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bride+of+habaek+ep+15+eng+subPDF 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_off0000c3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B4 17180 bytes
SHA-256: 340e0752c757240b55e5f20facd2479dcbb0587238c00903e099f18faed9fff1
font_01_sfnt_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 11204 bytes
SHA-256: 73ee0e1a47a3bfed335e31c7b82748d178e24ddf68609d5d3d4de0df83e346d6
font_02_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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