Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78c0ccf1d0f2332…

MALICIOUS

PDF

95.2 KB Created: 2021-07-23 05:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b53f0bb6a7b1625784106fc8f2e7506b SHA-1: 4b62de4f0d26e8a0e830df383290a4093c155fe2 SHA-256: a78c0ccf1d0f233248d3e7966f8049fe69a3f0b7d9520cfa6af68e71a797f185
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the structure and URL distribution suggest an attempt to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://alteanetworks.fr/img/file/givepamidinovobupetet.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430214838752864.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609477c221a8a---84766573981.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/70k3o26lqve0qo0r9as7565hnk/fibamazepodutijataf.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ggj846a5mselrqm0qj1hb8q1n2/bizugirimafumuwomugakim.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b427989a55a5433482a743951d1a35b1/47165444075.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bf0a3f42---fixugedizidaxubigakekeve.pdf
    • https://glaze-metalart.com/upload/files/69239899139.pdf
    • https://broadcasthub.com/ci/userfiles/files/76234766936.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f5891cc20---regorev.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/827dc132709a980735ec9688f2dc2185/83323797878.pdf
    • http://domusanna.it/userfiles/files/83686214297.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd3c4af2c8---79131953913.pdf
    • http://softwarefactory.nl/images/file/pudonosom.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f98fb5f1c5---89012557020.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160755eb6d61ac---77516123528.pdf
    • http://lineshare.net/upload/files/20210716093242.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/39117754561.pdf
    • http://apsons.eu/files/file/45485929349.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/21924408199.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/327587cd87551739699d3d1fb377e83e/pimelozesu.pdf
    • http://kirilmazbardak.com/userfiles/file/gusosomuwut.pdf
    • http://chinazzjx.com/d/files/73211089540.pdf
    • https://faresaldabbous.com/uploads/files/zijuwodolujuzenux.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/37e781322909d2709427d66dbbf01c28/rosovixovunesajiwufu.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/i2g8cdk31jq7abi0e41hkq0s61/dofufulatumofebamigob.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=wizards+of+waverly+place+season+1+episode+12
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010efb.bin
67108d3257d2e3abc3a86b8d39471471c5642bc3bbf9b3c0b89c5838dd387c11
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFB 11004 bytes
font_01_sfnt_off000128dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128DC 16792 bytes
font_02_sfnt_off000140ee.bin
0c799c400b63fa278bc9faf87b68063930d8e5307559bd90f8dddb02bc1612c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140EE 17764 bytes