Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2f494eaaf0d8cf…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 23:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c43d982fb2b5bf6360c1aa767d4a9c5d SHA-1: bee0623bd21bd603d47bde363a143388e37ee052 SHA-256: cd2f494eaaf0d8cff420c3e9e568c079c176b98d212ee81bc3d975ac20a71e08
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://minipowerpack.net/upload/files/zerutuzuzuvupusaz.pdf In PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/jixesadiniliriju.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/48628703931.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210905202411_4wxv8n.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090105092985260.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/92483575009.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9301cd973---71367010676.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/290a874568493aa285e7ee53a9b0248d/wojifewutorasudegutaj.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/pesoposukoka.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/73138100388.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/94035e808ce3fd6a8ab9ae32c5512c35/piworosa.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/vijixepopavus.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/digediledunibilonutuge.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/66714335901.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/17186397784.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2b422466---90287241141.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614012a1d346f---56226959652.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef699dafa7---logurexaniwezidotasiribon.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/fapukexolevujugoguzenu.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/topatasok.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/47542422549.pdfIn PDF document text
    • http://c-amc.com/upload/files/16351236539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=length+and+breadth+of+cricket+groundPDF 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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 18396 bytes
SHA-256: 930f7c080f92501450bfc41df1ba0a25aa8fbbb57c827cec0e77b131c4f76902
font_01_sfnt_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 10832 bytes
SHA-256: 1ec8f9ef3114978f24415277307cbe1ab5a2f91125fde41173b15400692a714e
font_02_sfnt_off00012a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1