Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f658530eb32b50…

MALICIOUS

PDF

73.3 KB Created: 2021-07-14 06:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d02400a35708372fcb64124319b24df SHA-1: 41c7e3c77a36fe14f1176b1e84d0cdd1b4c3a6c6 SHA-256: b7f658530eb32b50e6379be4df8be3ad010a0da57f93e700d65389e793f049e4
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=mapa+metabolico+completo PDF link annotation
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e9f91f7d96503bed897ce5d1bc061738/tadopijonitupe.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/cbe464ad993fe50df8eb8b5f61952f9a/64827956099.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/bizirufodog.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986e85e69f5---22481894399.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1069aaaec995861b95a4c3898c6c3986/40515532325.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/80034607002.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/71535849032.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf43164099a---datiwisevevegiguxagoja.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609642c8bba97---18280159604.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/74c5e62bf330d15a1a1f85a8e7c5b28c/11467671943.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/subisun.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ae1e6f6ce2a4e7e6c8e805ad0fba5676/1117838203.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5b0e6e98e1b5f6a89354eb38ff89047f/77861144693.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098593416e17---zokuserixurawez.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/5383720398.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/66172136565.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/wujepibugatuledexivu.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/mafokelo.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c981ded4b---texotasexakokeburaro.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/zafapudi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/26jj42206cdj3i7t4k1u5qm764/48825170365.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/44725716910.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf00d4b1d---fawuxagulerobo.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_off0000bd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD54 17232 bytes
SHA-256: bc017fbbafb29f50759bf01796d9391f50c2ac9ca6623522b528b4481e97cce9
font_01_sfnt_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 10296 bytes
SHA-256: c5d6fc92044ef86b9a5aae580ad9c2f66de3f3f178328cf2d613bd94a7982bac

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