Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3eca2cfb2e72041…

MALICIOUS

PDF

100.1 KB Created: 2021-09-07 19:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5f715efb1eb395564afa6eb856e34c2 SHA-1: ceb35f16edde079c4d7310a6a85b3b781373606e SHA-256: a3eca2cfb2e72041cb34e73bbc2a6fd9ccc54a61631619850c6f024071b23ee4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

Heuristics 7

  • 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.
  • 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://kennycojewelry.com/userfiles/files/202106/1623282181.pdf In PDF document text
    • http://tomei4x4.jp/js/upload/files/bunozoxelepewas.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a432eb8e81e---72917040285.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a91c1f32485cdff7e500962bc508892b/76807051386.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/pokepozodeveduwi.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/pojamadejofe.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c59c3a8ef83---40584674141.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/nitipowozusuzixor.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/xojumigajexeperapojuxu.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f08a89407a4---papizorudivinabakukigone.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/91246908402.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082aea92f94f---wewezixiwejuzusuwo.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/nedinizuxeralos.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/28526501796.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/95868741038.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/78329011174.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7a03a867d9c9aca0001128e34039ec38/zijipav.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830b75c4e1a---63438039555.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/89455964826.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/197331ed27e1729b4bdf74cda03cc086/34731847947.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830bbf49ae8---83859763789.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/lizipipu.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/susunulu.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/47257457657.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/nia4g4vlvb56mg627g1n4n391n/18309101652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=c%C3%A1ch+chuy%E1%BB%83n+t%E1%BB%AB+pdf+sang+word+mi%E1%BB%85n+ph%C3%ADPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 17100 bytes
SHA-256: 097957ca474bab4cfa3ec6263d6927fd3ddaa7aac510cea5e6e9e2da56e00759
font_01_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 12164 bytes
SHA-256: a4bf21b9f83cd5f34b9b7c0ce22d7420cf1c1ce7031ac2f367deb21911f82336
font_02_sfnt_off00011c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 26068 bytes
SHA-256: addfe7d7c2ebf0c133b350d563b12d87599e32d11233e02e4018af82c1801bc1
font_03_sfnt_off00015df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000175fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175FD 1872 bytes
SHA-256: a01217a9f1f7e6f5e8408d73f07734bac913c33ce378ee653c7b6b059500437b

Open this report in the interactive analyzer, or submit your own file for analysis.