Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef23f1184ec1a33…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 06:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13ee852e2ec806375173c7d6e5c0b2e9 SHA-1: 7b49bd1b7f9df9e5d946ba7f5372dbd048e93011 SHA-256: 2ef23f1184ec1a3343c1058aab7648ceff726c1d074daabe422a0d703e7a40be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=cmm+launcher+apk+download PDF link annotation
    • https://shevian.com/images/file/76255045075.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/xemakaderareg.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/wuvemalolum.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3100258c0cd9057fbfd675f1b122b803/zubos.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/gabujivit.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109070019235774.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140e8730e51d---94374381514.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fc6176c13---ziruxikifakenuvi.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/93985341523.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/11923419517.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/tenifukenelobomomafulim.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/raketunafarufivujipid.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/27438865975.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/24885335595.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/zonovolomokezimifumap.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/lojilavixekujetero.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/rusakifanekifa.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/siwasosud.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/80728508126.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354700698f---40689394989.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161416a45d1422---kidobovoxeriwunofivi.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/98578357674.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/sagitibi.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_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 10728 bytes
SHA-256: 119b62f5e42aa5d0837bda18c3976cad98d67ac1110e2fd1e211a1ff10212104
font_02_sfnt_off0001103d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103D 19252 bytes
SHA-256: 7d6f13a4fd1cf6ea87f119ab678e8efb892cc13eae6979d4e8f6219f0a4a8719