Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb8364be8f85ced…

MALICIOUS

PDF

75.9 KB Created: 2021-06-22 22:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6cc8e01cd5423ee3f473e24ec2dc96c8 SHA-1: 12351f2f79702fa8bddad78a17da12fed1c76b79 SHA-256: fbb8364be8f85ced574c3d1d95623a68ea50b677d2e87d66e49635f2b0d7ddd2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/239fa6ceaabef0487aaa3f9df15ccbfa/30707123432.pdf In PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef321337d3---40075364177.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/dorexa.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/s40hukf9f3gvod16lknvivaigo/domoxoxikalogozobukef.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9a3af2b2eab185638e9c51fa50038af2/vibefoxujeminamomepudexez.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/262a8173598453a63707b77a3738901f/rewujobix.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16086145d6a1f7---92914930649.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/vusaripopunazebepo.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/xawoneganesitanosufuteza.pdfIn PDF document text
    • http://jinohair.com/upload/files/repeka.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/88c0ceef1dc34053a2e9b617c0329fd4/padifebegamudodojaze.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1905fcc97629d6a1baf9390b7f43735f/vatuzefetubo.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f09bc67425---5891071718.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/80176101633.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/gigaf.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929f408f85d---vibitalilowosowodapura.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=convertir+pdf+a+jpg+phpPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 5136 bytes
SHA-256: 7765ad2213e67e9429eb30abd8e93846b9c630131ca1705edf15e419879ef804
font_01_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 13928 bytes
SHA-256: 88e0f747964e7a869fc1def43ebc3ec554404a5eb72944556ea6b65545f7afe8