Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd38f7fc6f8b14f2…

MALICIOUS

PDF

74.3 KB Created: 2021-09-01 21:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb5a9dbb0e1b3af3ac34c4c917c9ef0f SHA-1: d812ea2275fe3e5b02d8549f17f0c38656861629 SHA-256: fd38f7fc6f8b14f26ea8c6172182d9211cc350896e17a206b7d76da016af3f19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://garglob.ru/uplcv?utm_term=how+to+get+free+2k20+vc PDF link annotation
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acede97ea5---78975970896.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/3050942139.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/72571518432.pdfIn PDF document text
    • http://newcityhk.com/userfiles/sopimidavikuzarivodil.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/diret.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/50906194154.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160781a7d893a8---84485632773.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/f77clehf59cfopa9kia9rv2c3p/35285726240.pdfIn PDF document text
    • http://shahgrp.com/uploads/farabotobaporefa.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/kumul.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/tubezurerirukifibi.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/12777529015.pdfIn PDF document text
    • http://vkts.se/userfiles/file/zibedinos.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/nazulorunisidoxekuliririf.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/7e8e3e4916dfc56cd121583bdf27eacd/tawibefoj.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072debc6b707---48354306509.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/87780078664.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/14012220476.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f21bcf38b1ceb11341ea0e6eab3b1a9e/97704649589.pdfIn PDF document text
    • http://millecolori.it/images/file/75043226655.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/nerajewepedud.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/dewozumagemonilod.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/7913727425.pdfIn PDF document text
    • http://iwishop.hu/file/nexukevudekusumutu.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_off0000c0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 16764 bytes
SHA-256: 5f77258cc108cc195c8a46b6bf4cc650cdca39c1aca593fda79b6a0f52556f19
font_02_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 10416 bytes
SHA-256: 7cab33eaf3eaad9be3a7d4baddc6292377658ccf53947974a25828c74a518ddd

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