Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ea385ffb5d394e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 23:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 783b3d5f08861bc6714e62389a446c71 SHA-1: c2cb08e4e94aef20c943ca7337f80931ca0d52fa SHA-256: 18ea385ffb5d394eacdfcf6adb8885379ba90b239e7c490e64837d79c9e149a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of external URI heuristics and compromised CMS upload links further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://wolfgang-photography.com/userfiles/files/kiverawasibavudoxiwigaji.pdf In PDF document text
    • https://attack.lt/images/files/mixawulagurexopefixose.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/zovadixipomavitalexixif.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/95775707561.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/23439710137.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/67976832827.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/dadekuliginamukifal.pdfIn PDF document text
    • http://progetec.org/userfiles/files/zumixatelewijivemitimufag.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/22570788070.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/21551397426.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/misavimozopefubel.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/wakeropafipox.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161429592f10a6---34131286533.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/23699916608.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/vopibuwuwutiwi.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/24439739350.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/roxojowatugidabop.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/61898878464.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/57994058839.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/64500136752.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/pojukuse.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b0fe1657e2fa14fba9fed202fb51de0/xazuxovikipumoxokofimakuw.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/60064095288.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/2uqli76mhk44m3iitedts9fr34/kazaxonowugumuku.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/64729675438.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/derimapofemikimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=scan+a+document+on+androidPDF 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_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 18400 bytes
SHA-256: 889b6ecc323d67cfa5abd4c9ba9d8e6d43fec4f47f8784f3b1f2e113f488383f
font_01_sfnt_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 10492 bytes
SHA-256: 7c104784c96b7fa6e62f45332b4a42eff663c1e645f6c65376e653961e7d9708
font_02_sfnt_off000130e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1