Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b69a88e0d73d55…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 20:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 508302c206e083ee4c5de2ae9e3b60f8 SHA-1: 25a50186f9dd153581c85e4c5929186a1d6980a5 SHA-256: d2b69a88e0d73d55532c7d7fac9128aba452e3ff62a16d2329d25416e49f9b6b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=serverless+bluetooth+keyboard+apk PDF link annotation
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee77b31f6f---82836535750.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/70546996874.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/tuxepupirogejutudimebuvaj.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/12742616777.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/fixemusidafelanufupegusul.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d761535e5e---82415043678.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/pivefezibunosimixim.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/39483953892.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/35843204884.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/14802876704.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/38449580697.pdfIn PDF document text
    • https://computerzone.pk/file/gibiwatovibatev.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/4292150554.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614dab8f68da2---leguzebuzebojowokefo.pdfIn PDF document text
    • http://ingore.cn/upload/files/35523469873.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/56139330822.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/36775206098.pdfIn PDF document text
    • http://coachhouse.info/assets/file/78028055496.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/29038819738.pdfIn PDF document text
    • https://subded.org/userfiles/file/25408618677.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/bokobanati.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/8037395123.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/gazawamamogok.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_off0000b17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17D 17376 bytes
SHA-256: c9599925a1ad8017cfab63e90a8bfc26a6a43bc500a56644c18d0d8670bece20
font_01_sfnt_off0000de76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE76 10880 bytes
SHA-256: 88a16c2da98699e011d2b6929beaadae6b16e6ecda16b46a878bb6d091abcc50
font_02_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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