Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7647196a17be912…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 07:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 339335b6a3234f79dbabe8c5c7d0fb7a SHA-1: 03a6e6d745afcc8f4b0177801d5c3ad4d878e809 SHA-256: b7647196a17be912ecfc9617bb90a67dc4bbf469650b98070db784231b1f20d0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating malicious intent. The PDF's structure and the presence of numerous links to potentially compromised WordPress sites suggest it is used as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://alnadaoil.com/userfiles/file/69223510363.pdf In PDF document text
    • https://muzeumkonstancina.pl/attachments/file/bodek.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54289aab6b---rumagelowev.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/zibenunazaj.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/gemolaremujamitabu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd65a14d14---foxijodef.pdfIn PDF document text
    • http://nemochem.cn/upload/files/xidugemuvuxedupopozirijaw.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad900757487---24637550742.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac727b2b7a9---91629716972.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160892d1d6c35e---pijusaritedawelirosudavan.pdfIn PDF document text
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/kurixano.pdfPDF link annotation
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/judugiwebemat.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/c0a531d70377bb07282a31cb8181a271/2241440748.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0f8ac3b6---92069818215.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3bdf9fc13a632bd87da2199489a1b62b/vizipufepiboresenoka.pdfIn PDF document text
    • https://biocoils.com/img/file/sosoxase.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/21575191103.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202108090800076164.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/marewavijoveratoxakares.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081f4e4ed3cc---11318895718.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210722_B0CD49EEAE268AED.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/18986806840.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/62822237251.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/38554338896.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b358189804d---51108255986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+summary+of+after+twenty+yearsPDF 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_off0000d5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 10604 bytes
SHA-256: f96d83b41ad736652a256431983f1995d1b9dda605d2414b89f0f21fd1c10b93
font_02_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 17192 bytes
SHA-256: 082571a3e0de559f364f1199b0489412d2ad532c978fcf72b2150f270596a474