Malicious PDF — malware analysis report

Static analysis result for SHA-256 187a14438b7d3450…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 17:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 52905c857c3e2e7281fbb5b8aed4c64c SHA-1: b8a04c574dcace14dfc16db966a6142a7868f0b9 SHA-256: 187a14438b7d34502bbbb2e74fd2237b69f328a509b930adabb9783a5c1bff3e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=cracker+barrel+menu+pdf+download PDF link annotation
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4dbdf4c68ca47cc417c10ef540c0e32a/dewagokadizigesa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e83379e2---rawuxisidap.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/81334675832.pdfIn PDF document text
    • https://olterus.org/contents//files/zurutimenanugagejijuje.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ebf366f1---mejorotupunizopanideg.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c392f8dcff8a9a3e2ff1350a7d238144/xilijorexeziwul.pdfIn PDF document text
    • http://mosjob.ru/images/file/76367661333.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c3520495506b681c6a8e0e8e06334a42/28767341857.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/72447671770.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/57841079686.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/46545369024.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f8a72e797---vopitevaw.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/1364692693.pdfIn PDF document text
    • http://naso10.com/userData/board/file/45184243295.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/91128f3515d87df987b22aabc3c85f13/gifasup.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/nufilefitivenajojujedat.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a611041a748---wugikodojopuwopogu.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/17182dcff4851fdd3457c707c82174e5/60581671484.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/khii045p9tmgvqrclqf9uo47oq/zudagixiniwada.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/bozizaze.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/xusarerosa.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/54308202707.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/wubegam.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/9427683324.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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 17836 bytes
SHA-256: a80f5c22721a342b1a6faaa9df5466599c038a32a85a3b3feadf3091f21df718
font_01_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 10872 bytes
SHA-256: 7f3644e275156b99b1142a815eb091e1f37ad4a00c2df36b2917053d3c5abb33
font_02_sfnt_off00012662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1