Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca552dcfd9721db…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 12:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0bff4d18bb3e1be20cb229533654742 SHA-1: 88621c83b82d531e8707251233717552762675e5 SHA-256: fca552dcfd9721dbb89d0dabe77393efcb590314cc8b905fa0a2f895a2034b5d
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains a link farm pointing to multiple external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The PDF's structure and embedded URLs suggest it is used as a lure to redirect users to phishing or scam content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=how+to+change+font+on+redmi+note+9+pro PDF link annotation
    • https://normec-cm.com/ckfinder/userfiles/files/neludejikes.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/41991008101.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/mezozovap.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/3360506012.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/96913584592.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/bapugepofuvebifek.pdfIn PDF document text
    • https://thehouseproduction.net/file/xibomitabogonuvudinut.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/6140204703.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/kexudokunogimowediko.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/50310366005.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/89696692203.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/98000944502.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/mirar.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8640e275dabe4bb829442d3f21fa6458/bowipuxawufol.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/21440599380.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/82565071008.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/neduxefavufevubuzo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaf3855d5f---7805702861.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210907_3B15D8F8CEA500DF.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133452bd60ad---zupejafakuz.pdfIn PDF document text
    • http://netart.hu/userfiles/file/48829731039.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/52498003267.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://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_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 11096 bytes
SHA-256: ba1a6ccf29cd40ea3886e5beab9e42a2ccb01ea654fae5779e030b45346d5c7f
font_01_sfnt_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 17968 bytes
SHA-256: ac91bca3fcc80739e861caf65b1cbeaee7b88c8e24bde754b1215d226519f123
font_02_sfnt_off00011d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1