Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f27d6ed79ef6f0…

MALICIOUS

PDF

76.1 KB Created: 2021-07-02 06:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65e069bc307291a2762bcbeb0654f8c2 SHA-1: c284449bf51d18ec2234578c6822cb78ee826748 SHA-256: 31f27d6ed79ef6f0d3778e513f8ac840b332b39ce6cc171a717b97f60f61f786
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by numerous external URIs pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further malware. No scripts were extracted, but the presence of multiple compromised links is a significant indicator of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=inside+man+most+wanted
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0519266db9---65450041875.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30e9090cfd---60088824803.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/83n0bfhq6q2gugv419psor05lo/kexawudinipimalorox.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/mi8mlmdsv9mooaser8nt23aq1n/44413584899.pdf
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/46216117490.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce46cc43c7d---pepimox.pdf
    • http://trunglam.vn/uploads/userfiles/file/fobesowiwav.pdf
    • http://teplospectr.ru/images/files/navomidi.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/lvja539eljpreq2t0p86p6cvu7/34207253226.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/be2543684ed8fb0e7f9c691c681c5d05/7025135758.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae24582dd---joloxexifilaxevemidag.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-27/20210627150009644053.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6eec90d3d---78978924211.pdf
    • http://lactopad.com/uploads/files/92247422806.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/4d759ebe185216469fbfea214228737f/jabajixagikelu.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/4f0358ad5adeff407da9b3608128103c/71157865478.pdf
    • https://hosvagyok.hu/userfiles/file/jadodul.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/20cd3e13da16fe3ff530ec2190baeb3c/ferolokinotuwaforadelire.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/73de304eb845b55823704bf903bfdbbb/dutoxudamomame.pdf
    • https://sanvexe.vn/webroot/img/files/jelogulimej.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608937a1a7b72---62907371205.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/l24hhaua82f1afqocgu6hohiom/23763259034.pdf
    • http://enjoy.sk/editor_uploads/system/files/fetutenimoseju.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_off0000c856.bin
c3f1d74e87ba757ed3ce1cb294888b5fe3d010fea0287903c4221a5284a258f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC856 16808 bytes
font_01_sfnt_off0000f3dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 16792 bytes
font_02_sfnt_off00010bf4.bin
96246c49846baf3cf7530601926079cb9e5c171642cb6ae73e4dc2edd5b8cc43
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF4 10300 bytes