Malicious PDF — malware analysis report

Static analysis result for SHA-256 c873f5acca550ffe…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 21:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a189351572b127309b450c6ae13d4db3 SHA-1: 1fc6f176f9e22da6a1661ceb7a64b7615db797e4 SHA-256: c873f5acca550ffe0db1ee14bdfbbf042622da5e3bf3cf0600426acb8cabcdcb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links for SEO manipulation or to obscure malicious destinations. The embedded JavaScript, while not directly actionable in this analysis, is a common vector for further exploitation in PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://asthasupermarket.com/userfiles/file/lajanebedokudido.pdf In PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/14323653449.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/sogedavugokonetaxuka.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/96684357818.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/jufuruzoxobuvewerat.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/miwopel.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/gutuwitorupogetofaposipi.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/difugukenusuti.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/gipenunukupobuwekug.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/493b3e46397b71eb733d3760831e4684/19551816607.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/466521893.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/zudadubizegufu.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/93994163420.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210914031051.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/58527569627.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362fdd79678---pukiwijifosenezuri.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/wafuz.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/2026469185.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161409e397cfc3---kisajik.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/nopipavanarigov.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/pofak.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/bekewulifegor.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/14203361604.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/noxup.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/39020961325.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/80151687108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mcpe+crack+apkPDF 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_off0000b27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27C 9824 bytes
SHA-256: 91a872d720b5fefcf01fc2b36e39ffb580a91303a6fad6b3b93b7f68663dedb7
font_01_sfnt_off0000c830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 17156 bytes
SHA-256: c425f238faca9fdc47da0a2214ad116e13e774bf711a98f85504741c7aa51e4e

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