Malicious PDF — malware analysis report

Static analysis result for SHA-256 a228103930ce3d00…

MALICIOUS

PDF

154.5 KB Created: 2021-08-05 01:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d9c0b4e3c7fe760f8aaec5d98ab08cdb SHA-1: f63e75167f221a7fa1173612bf6dfd28022b43e2 SHA-256: a228103930ce3d00b70e6699bae1d563e786030ca9bbbc492672af84a0b7d6b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9504

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://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc1f5bf0bb---41695142930.pdf In PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/26133325479.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/93205171231.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b050ef28ec4---rafojisupawununimabiliger.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/17823814029.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/4473121973066dbac4f137c1827890ad/34050221076.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/meselaz.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/65109691363.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/g2regjk9dc8oiq6s1cl56lq8ae/93747510816.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ohks0ldd6j6qd1bhh6fptjj615/7928502886.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1d6e3e0e15d21d992281e666d584d4cb/15163470629.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1fc003d9a7d3bfb934c757780a3e9a66/jizobunenuk.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/dekozugigogazijo.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/dubebopibava.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfdfda95eb---1435707444.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/sorikemalefos.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/71363736730.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/rabapakesolutofunosirawet.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/84788736064.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b126b244b52bffeb86385911a75eb944/sufejemevo.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/82254830359.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/de2be0fc6dc893b959614884d70e38dd/74047222889.pdfIn PDF document text
    • http://polkovnik.su/upload/file/99549618348.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/joxafenon.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/2965880060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+songs+did+queen+play+at+live+aid+1985PDF 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://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_off0001f688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F688 11552 bytes
SHA-256: c6f302d6bbe6626accf7ba8d9d02959c5f415acae642b35139a33f6c90ac3cdf
font_01_sfnt_off00021179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21179 18776 bytes
SHA-256: c1f534dc8d7d50df49385c0b63ae033cb20c09ae2405963c45d619f73e65b3e2
font_02_sfnt_off0002427c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2427C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1