Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcb3645ba35b171…

MALICIOUS

PDF

170.7 KB Created: 2021-06-20 11:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8aaa155a5e357a877edc9d6ad5739469 SHA-1: 2a0101091cfab9a8affcede18d2bc7d6bb66834d SHA-256: 9dcb3645ba35b171ff8b114f6c8b53dc0a38303ca266beb06c65df8482f805b2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2b719eb0ba3b4b23044918145af1f1a9/5505773242.pdf In PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/0set14sjqcjur1drfdhdsjade5/toxowajurafakewetu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a40a7b7c66ddee1c69e6429eae51fda7/lukatef.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/60485716357.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/pijituxiw.pdfIn PDF document text
    • https://inncredel.com/uploads/guxexigu.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/nogaj.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6d09a0b93---logomi.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/68964204294.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160995b94a3032---34884522833.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/vamokuwanavubememukokin.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc2c0c8e5d---64657076062.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b788943eaf1---64230988543.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/1395554566.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=elasticsearch+update+index+mappingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24559 5284 bytes
SHA-256: 99301806e6ece6fa7677e0dedd9ec26125605d7283160ff6250dd75a8473a3fa
font_01_sfnt_off00025711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25711 2744 bytes
SHA-256: cb03acd017500927988b7e50e495582682f6c23237ddc20251056c6592ca1707
font_02_sfnt_off000262bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x262BD 13036 bytes
SHA-256: a12843b9a43a6c7bd4d65e3a42f3bc79ef9d13e9b260f80ea3c72df620d419d5
font_03_sfnt_off00028e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28E9D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361