Malicious PDF — malware analysis report

Static analysis result for SHA-256 0808acf062bd64b5…

MALICIOUS

PDF

123.4 KB Created: 2021-07-01 09:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ee5387373a3025fb120d2c3b42efbf3 SHA-1: f256eb0c2f3850534fab41ac6f4a247317a835bf SHA-256: 0808acf062bd64b5155df0247297d7029f3b03d5ec13f2bd900847c319bb4209
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple external websites, many of which appear to be compromised CMS upload directories. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or host malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 5

  • 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 http://bostonmentors.com/userfiles/file/39194109465.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bede752b5---94645291969.pdf
    • http://mikailang.net/userfiles/file/20210514083038_1484764960.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7n1t7he2vtjnge472npdls4lk3/guvuxejibuxipepupurufas.pdf
    • https://wecareprogram.org/images/file/4128580500.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b600e55f29d---58670519983.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607522dfa064e---xoxegelimefidetumuladepuz.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a3fd54934---88532984698.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f55494e66---pisok.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/fed13856f0f3a61764ab6906010e9090/99585111636.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074518304270---wogunez.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c48da3db9---93797702258.pdf
    • http://janandpoos.com/clients/872640/File/tejiwilef.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/04d89ec908fee8e86aba14b4bf0aceb7/noduravuwub.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/b4c0505be6df467c38c185fc072b1c36/12226447263.pdf
    • https://evermoral.hk/upload/file/1623829410.pdf
    • http://arredamentoambienti.it/img/file/55134030860.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afc12bbbc---waginuxinalozorodep.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b466ec79451---farofuwa.pdf
    • http://jingluo.net/uploadfiles/files/kivunoze.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/39bf5be26c211d05cf8c8e106b1747de/40996725840.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6f6b07c028334e46e01b8bd482272ce7/bunuzuzujuzosumozupap.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f98a0f087---nokujud.pdf
    • http://quickvideo.nl/userfiles/file/wizexexipitox.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mage+rogue+2v2+guide
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001729b.bin
f49f58314f31b1a70ed54bf23527a6d744001ce410838b108a6815fa7aa6ca54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1729B 10284 bytes
font_01_sfnt_off000189bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x189BD 16792 bytes
font_02_sfnt_off0001a1cf.bin
8e92b068b989c4d01f30e0c54ae69be0459e6cb62c8206459796dbce26798c2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1CF 20200 bytes
font_03_sfnt_off0001d634.bin
a899815da4c2fab37241c9a2f896c1d366ab2b11c7f388cc3b2b31a475d43422		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D634 2280 bytes

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