Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b5755d67b06f1a…

MALICIOUS

PDF

76.3 KB Created: 2021-09-13 07:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f377ec108e80e987be7c52c58f82e6ec SHA-1: 09777adce697c903e044ffab8a98cd0e546c26c2 SHA-256: d7b5755d67b06f1a3844b94b86debc21c78626af5df284b5850a98f8ef0945cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://muzeumkonstancina.pl/attachments/file/buduzagapux.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb85d65f3---pubanobamezujuvorugataza.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/wibegejujubo.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78489475560.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/fowejodomo.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/95980862705.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/nugibesowarivenuvo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161361ac1a61db---36391990719.pdfIn PDF document text
    • http://kustari.net/userfiles/file/84272910518.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/fimunakasozazi.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/ratiwewudopuk.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f44b63c461---nejelididewepozetumez.pdfIn PDF document text
    • http://jonme.net/ckupload/files/84520625579.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/pagugimelidesitorim.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/70591359989.pdfIn PDF document text
    • https://dalba.net/other_files/File/99172651775.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/wizivuxuvapavib.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/70263815340.pdfIn PDF document text
    • http://slovoveri.org/userfiles/50310469691.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/11014387741.pdfIn PDF document text
    • https://ekransamara.ru/files/84758365579.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/duzulugek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hack+phone+with+ip+addressPDF 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_off0000c5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 17408 bytes
SHA-256: c9c83d2b085b630de42695cbeb36dc99352456171740039a74b06e5ca93ccde4
font_02_sfnt_off00010b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 10732 bytes
SHA-256: 38aaa379ad634f7fe9cb9e600f4b691bf810e589fa329226f7ce07b6b17462ec