Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d424141a1b8379b…

MALICIOUS

PDF

74.5 KB Created: 2021-09-05 17:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8749bb25a3c0c0c051612164eae6fbcd SHA-1: cfd022a97a83e86d6d0e6c5ad389b6e8b462b4a4 SHA-256: 5d424141a1b8379bc31d4e76ca95d3bfb5efcdf3b14a3d208be2baf953c0ac9d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to deliver malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=manually+search+for+network+on+iphone+8 PDF link annotation
    • https://cubic.is/userfiles/file/6127116169.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9b35ba8c9---93086391688.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fc202fcc8---dunovatikosedozo.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/89128817395.pdfIn PDF document text
    • https://inncredel.com/uploads/fowazovulu.pdfIn PDF document text
    • http://baptistfriends.org/media/97181850160.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/bavurisodujevamuxopotaluz.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pifodazov.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/69cf5f0373306ff8cf9a4ed8950b4871/88805817523.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/27117b363a48b9e7d69952110dbf71ca/76355707798.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5d0a354c---kogira.pdfPDF link annotation
    • http://strahovka66.ru/userfiles/file/nedakododijov.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/mukuraxolowuri.pdfIn PDF document text
    • http://billsky.ee/files/file/rabikomuzowulixiw.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/boxubilodixofozet.pdfIn PDF document text
    • https://avflash.nl/upload/files/35335626070.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/xoborif.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/16678676385.pdfIn PDF document text
    • https://www.pbri.in/ACP/ckfinder/userfiles/files/vezagagulelifajarumu.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-8/file/57938835546.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/zusijogenobusepedupoxina.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/24949876992.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee0ae6efa5---jibetotedanamarevimu.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_off0000c188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC188 11168 bytes
SHA-256: d0977e2dbadbab3a3e06274239460c33acb1bee077e1e5a17121702ab40685fb
font_01_sfnt_off0000dbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 16060 bytes
SHA-256: 07d50243d48a1b74c70db13993e9a3cb4ef68e2b666c7c828b995f7a55d9782a
font_02_sfnt_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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