Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea235fc72603a7f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 09:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 62984ae5d8550a9ab43a6af6237b4c7c SHA-1: 975dead440b0d1a485f6403ecb6f5c4c607a3c2a SHA-256: 6ea235fc72603a7f0ab59db3a5b9fe9548ffe124322e04250baa680402e2d975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, characteristic of a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://wonkingchina.com/d/files/vedolazo.pdf In PDF document text
    • http://paulsaperstein.com/userfiles/files/banunonepidifor.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e79fac84d6521c58ab93c76c6f5cb3a9/xexoju.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/95292715228.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/nesuso.pdfIn PDF document text
    • http://baove24h.org/upload/files/40238357626.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/6417020652.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/nefivoxozum.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/76580049714.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/15148207017.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d5dd71df4d7e4e5bfabc132d7150e020/91228094393.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/walurajaxi.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/fekaj.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/literekoxoronifamef.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f270def34---28061562913.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/fegurakumopixujupegunudo.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/tigeporij.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/xupazodafeb.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/mawul.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/xinozajadibimoribuwikak.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098adf30790f---86710324579.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/lasavumujonifif.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4d3ee9194---sepime.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/48813871206.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882d8f67465---xaparaxajedezerelajorofov.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/5136527735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=2017+toyota+tacoma+manual+or+automaticPDF 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_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 16544 bytes
SHA-256: a6fed98c8d859dd68bc31cae98a9bffbb1b1a468e2d977061fd3c86202d648b9
font_01_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9C 10552 bytes
SHA-256: 9af0b36c4bb8b519e9a101cb4cfca9c3d26f9e15481f88cb6eb5771ca9f35760