Malicious PDF — malware analysis report

Static analysis result for SHA-256 558e98f38c77cc08…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 04:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d1dafc129259747213e6ac4c3749fe4 SHA-1: 2fdcb0d78ef4bdaf77ec7fd4684e61e57a5d3bde SHA-256: 558e98f38c77cc0832055e54b63a543a45ee8a813f9fe2085e84cdc7a8d5bdee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect the user to malicious sites for further exploitation. The presence of embedded JavaScript (T1059.007) is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=how+to+edit+multiple+page+pdf+in+illustrator PDF link annotation
    • http://carnow.jp/js/upload/files/zifijedabetasotopuwim.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e687ca3608a---nodijixabidevijex.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/fofuzefizaf.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/32ff83c1712a6b28589119cae14911c2/31359180595.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/bubivasenovuxiv.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/55542573196.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/kawofuduriw.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/608b3e40b003715c292626a6a0049076/tanifidowugirija.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f10d5d965---lusededadiparono.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/62806373937.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/9b542a9636d7e54d6902863c9f541df5/zamovorujipowudepurajer.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977eacc14a2---kudusesasewifiz.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611e44b7a9fea---musitojujunomerij.pdfIn PDF document text
    • http://cmtsport.com/pliki/surowuwiti.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/52b7e7cdbcb971d693b03aa7699a736e/98735379535.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/fobafogivim.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/posiwoli.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/sb29bf4kunsrdvk0kout2306m0/50367707402.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/0bf1721d32980295d64dcffff46fd33f/81529138461.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/kedutodezewiter.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/98157322732.pdfIn PDF document text
    • http://beiks.info/public/file/fetamufi.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/rufat.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/75087289671.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_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 11016 bytes
SHA-256: 3c42735047e7d8bcd87ba1b9cafbfdfff14df5ab011351fcd2f9caa112bc48bf
font_01_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3F 17952 bytes
SHA-256: 4c42fe335c0c42633e68ebc5c29954eb0b997910537e751cc3641e4099b1295c

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