Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c36d201a6c7757…

MALICIOUS

PDF

88.5 KB Created: 2021-09-22 15:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b267d2e63cf3613e9f3b3624f6aedda8 SHA-1: f37d3c4c1ed91f0c33f2f0225bdc7e79a284e05b SHA-256: 04c36d201a6c775726839212ba15f1aead04c8a318f48609e482bd2c63bf8cbb
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or redirect the user. The link farm structure, with multiple URLs across various domains, is characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=all+stars+3+full+episodes PDF link annotation
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e4b8149c578dc9730ddbc659b157fb58/38677655817.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/gemorabewatisabifizi.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/54700753827.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/18267043393.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/kaxalowaluzasataxegav.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/37479651051.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144ce766cfb7---vusija.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/kodulawojivirikogi.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/taxudeluxazati.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/sodewovixel.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85574769489.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/vogosowuxunipegog.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/zamumamawin.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/loxuvofe.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/xatasinif.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/lavowolugabog.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210910125153_kmv8so.pdfIn PDF document text
    • http://crm333.com/documentos/file/parurusigos.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/44258027583.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/xijusobugafidababedef.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161390336a8bdf---46174652008.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_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 10640 bytes
SHA-256: 66dd937c4be9cacd98e4516a9f2bcb4e53611d6e0e5281570bb715d7c9978bc3
font_01_sfnt_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 18248 bytes
SHA-256: b94df1f31dbc4cd81508e1b86eb9428008246d1f2b1e899464be32846406d851
font_02_sfnt_off00013c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.