Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e01512d01ec799…

MALICIOUS

PDF

70.3 KB Created: 2021-09-08 09:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eccfbe28a70c887b66049b3a4cf5e58e SHA-1: 6f9a93f6bfa672040fb3417e116fefbb872456a7 SHA-256: c2e01512d01ec79945818a85a4c0aa6f6133735e5db871c0655c841209d92d95
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=ap+biology+mitosis+worksheet+answer+key PDF link annotation
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/66c613047d2ff9764041fdcf71451f77/gaxedewolirabafanijofexo.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/72150666210.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/30058710172.pdfIn PDF document text
    • http://soupworld.de/upload/file/sobujopuw.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/kawakiwoz.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/tijawegaripofumiboja.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f642f96dda---65540893893.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/51166903970.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/s84cteaq2ebm8f8iu61ddgainu/3652825093.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210907111449.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/wizasodopapas.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/jijisezamulasir.pdfIn PDF document text
    • http://crm333.com/documentos/file/ropipadedezozar.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/69956617660.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/vawinotewuxo.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/84058981737.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/df2ae6cd492407231ebaa86f040f6781/bexivefanelegaso.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5cc462eb1---rugejeruzaloniloxifin.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/27586010239.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae318f38422---sigewupuf.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/fefisofibijeloma.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/29963665982.pdfIn PDF document text
    • https://brakos.it/file/nivobowowuzin.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_off0000b32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32D 11112 bytes
SHA-256: cb9f23c29bfa10e01d8798db809b163c4044a4a793d0d6682e624b5a90c93013
font_01_sfnt_off0000ccd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 15228 bytes
SHA-256: 380c1acf7775dfd07fc1623cc8bb778d75ce49651b49e0b1c21a30cf91dbe173

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