Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba518b131e432de6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 17:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8851c565354b68ff331a94b04046d7ed SHA-1: 026bc4b44b38809c6de71a62785df3e4909cd0b9 SHA-256: ba518b131e432de6e343148ad8950e8ce736f40fc8d3e59f853e9ceb2b208858
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mosaicopeoplecorporation.com/ckfinder/userfiles/files/2736545947.pdf In PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d881a0bea942d36e99efcbcd65b88871/totikagawimeguki.pdfIn PDF document text
    • http://unseretochter.ch/images/file/80189141959.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/gukudenanopisumufivu.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/76157531582.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/pidavuvesonunutoris.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a37a80e0c3e---48919718615.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b5391dc7504fab2f3e8df914671c4c59/vakejizid.pdfIn PDF document text
    • http://allycatering.com/userfiles/ponopi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb1cd8b17---devafu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c295bd4359151c862bd2c0f7ab52a92b/81832636591.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/80669816506.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/m3cklao8e97nl0npqgis7vqu7i/74054224357.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3avesngho8hcqqtftd0efs85j7/pokakukokawilulexo.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021082202062466.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/77616790137.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/5127743595.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607df29a110e4---zizumizuwimeb.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jemadipefes.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/geligotimuvi.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/nkqrod875iamq64nj80tc84s3q/59718178876.pdfIn PDF document text
    • http://lactopad.com/uploads/files/71442776662.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/kewabis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=acids+and+bases+multiple+choice+questions+and+answers+pdfPDF 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_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 11340 bytes
SHA-256: 159217de1eef0cbe62c80decf6a8c82adc5b3e5db6f9e1604d0c7f25d2c3f47f
font_01_sfnt_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 17496 bytes
SHA-256: 0452e31bb7d0fbd75afbe52f1119a5983318a477ec01f0d3411dcd9e101d50d6
font_02_sfnt_off00012571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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