Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd516e2cbd3d28fc…

MALICIOUS

PDF

88.9 KB Created: 2021-06-29 13:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86cc42871e6f93e446459ad45a24dace SHA-1: 7bdfbf11445f5205f1429f7ae2d30d1fa4f40953 SHA-256: cd516e2cbd3d28fc4ffd4bab9f845a2d2aaadf1e417a8df28cfbd8bdb7fce79d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bbfederico2.net/userfiles/file/jasaveminexunajarodirixo.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d99bb02a8---rojud.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3e26d5fc5c2e5d84ac31d4672a83e2a7/99943071993.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/3b2318748cd9718882d1f169c7c24a3f/25598186536.pdf
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/81616322511.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b07b3cdff711bcd75200ec87058ceb5e/6501172478.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qpt19q5llcp22l3607ovjjgugh/rokev.pdf
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xugivafatib.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/gji3g2vma461ga6afrnh6s8tnd/35997026967.pdf
    • https://stdtekstil.com/upload/ckfinder/files/wigozume.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a170574168392bcc88be86b01c2f00cc/71689131732.pdf
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/pusewisewopavarigojit.pdf
    • http://www.bash.cl/media/file/tiguzo.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/ef9e31b94dae30b0309891ba2fb906ab/ligatojikolu.pdf
    • http://jingluo.net/uploadfiles/files/junetug.pdf
    • http://agiusfuneraldirectors.com/files/file/jepaxaxonamaxapabopusad.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/43963567491.pdf
    • http://automotiveenergy.cz/userfiles/file/66565039435.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/f98f9fc36d4c023f4042b42dcec84c82/42420492609.pdf
    • http://bagiez.com/userfiles/file/xolukodeso.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c72f60df1a---pulimeburitolimoxe.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47b6e8afb2---lobixa.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/69eb905795d8e6c3b4df6589bd71a0af/nanumusovajozetopa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=introduction+to+computer+engineering
    • 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_off0000f991.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 16792 bytes
font_01_sfnt_off000111a8.bin
2fa55fb20320eead8a0599e810bf8a6a8d55c776b6c9ecacd40b54f2d65a2b2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 10532 bytes
font_02_sfnt_off00012960.bin
8ff72b2244ba7649103dc028ae2eb0af271b742f1f9590b013167ef485b9ccca
pdf-font-stream PDF embedded font (sfnt) at offset 0x12960 17320 bytes