Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aae8058b15aae34…

MALICIOUS

PDF

80.6 KB Created: 2021-06-29 05:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 140b0d84a6f8b5bf9a8505a4459cc129 SHA-1: 4db7349a2f35913def43db166c35bcd832c8447a SHA-256: 1aae8058b15aae347fce487669ca808e6d53d2437cd92bdfcb3a754e47edf7b1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect the user to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9b068bda210a8762ce606ffdf123d629/kineje.pdf
    • http://shop-cartuning.pl/userfiles/file/jafetus.pdf
    • http://planbmedia.hufiles/jeguzafobumotej.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4ff46687622a75105a8a18e26ff0277b/dapafa.pdf
    • https://panama4d.com/contents//files/nidopikadukan.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f269af253---nomijidibodizimetiw.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ot0fvmibpnnj08h5l21i5ed1vq/rugivosidobudakimaru.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f0eab3d6346dc3c136c9076ca25bd283/mewexa.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/56094dbf53c697e9200345ca9a601ff8/56633085152.pdf
    • http://ajtoablakcentrum.com/_user/file/27625723490.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lafuzasimesu.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fab753fa8---zedipugiweliwuvami.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/19937109476.pdf
    • http://rydelko.pl/userfiles/file/85917496602.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c80ae695d1---satalopoxilamadoxixasebe.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/8537803869.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/4iam00lb4p85lc9ghuhatqpi05/77788534100.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67b5aadd8b---95650282036.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd80c18c0b---zigufonerilenumiva.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/8c2cs87na24j1rsr858s0bpoc3/81102174706.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/wotixobobor.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=electrical+design+drawing+and+estimating+1+pdf
    • 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_off0000d519.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 16792 bytes
font_01_sfnt_off0000ed30.bin
cca7931640834b92ac514973c25889018bcc267b17e7a97c14bc9da095e2b021
pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 10964 bytes
font_02_sfnt_off0001067a.bin
69346bc7bd1f6ea196d9e69e6f0fc76b0e981690c19a037aa13956be101f20da
pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 17644 bytes