Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0c95c7b8d10189…

MALICIOUS

PDF

87.5 KB Created: 2021-06-16 03:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 49281c00b35b1069a8fb6a00a7b41d51 SHA-1: 9cc70c4637edf8aa3e9dad11d546a9ea19620775 SHA-256: 4d0c95c7b8d10189f75db8161c73b9befae652942fb6b4b0eae6edbf955389b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/uplcv?utm_term=cmf+indicator+mt5 PDF link annotation
    • http://ekonopuntos.com/campannas/file/17868843570.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd86c723fd---83085685406.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/busidividawo.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/10237692614.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c17aeb04470---34588832790.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7eb09630d976fad0007504e38b9ab98e/zafizuwa.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a4f2e27a9ecda62f2107a51891588cf4/57638274734.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/590c797848f4ccccb38de46c616d358c/30966840619.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/mabovijedorenamimarodubu.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/januwixowamu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b6e664860---pulagisuku.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608120e77cfc3---wulerato.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/28889542394.pdfIn PDF document text
    • https://medtek.vn/storage/file/gopofubufolovifasolon.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc76b20ca9---navinat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/10242443056.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 11944 bytes
SHA-256: 754a03207c3d57f17a3ee1b609ee4c5d97c052a1548f4f15d2fc706fcbf901cf
font_01_sfnt_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 4988 bytes
SHA-256: 3b84357b8bec1babc6b26fbbd72ac1092dd91b22dccc17265fef3ba84e388001
font_02_sfnt_off00011dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAB 2572 bytes
SHA-256: 6e90b2cf420b0ad13856d6f5ee75627e7b3d92fa4d3dd1bd83b2e8470dbd12f7
font_03_sfnt_off00012867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12867 11300 bytes
SHA-256: 68da6d9127dd45f5610133de9c406e1fa5cfa0d36ae2a1e833bb12cf73232eca