Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e5f24e606a8ecc…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 10:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 699aa8a6c51e1ca10b1e9873b3e3622b SHA-1: 0ee6307cf25b147c28e4f816347e8d226f730ad6 SHA-256: 62e5f24e606a8ecca1f8fcfeaf339f054f88d0773829111f30951ab025454cc1
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://faurerom.com/userfiles/file/livojokebizevobefodiboge.pdf In PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/wabobenoposej.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/8296b48c1bac6e9771f839a91c4da370/xafifepabogitawiweriz.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9bleaoenonj21q7bep2kibdab/63621203433.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d7742f5f615e41b5dc0147caa62115f0/57650307678.pdfIn PDF document text
    • https://camelcarpet.org/d/files/mabuxinamemul.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/15127860591.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/669ce78f98cc475daf4f1d7267a12114/27920192672.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/rulebaku.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/15624703585.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/kaxekokudalaxonudabukarek.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/sibobuzavagapadaxeguvoduw.pdfIn PDF document text
    • https://premium-house.uz/images/file/guvurivesuzebisaxoja.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160825f0933cf2---15906172602.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/aqofb4ejrj5mlqfg172210tmq0/duwevemajasudoj.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fevilitifutakulolufi.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/tibabi.pdfIn PDF document text
    • https://alariel.be/userfiles/file/vofupakolem.pdfIn PDF document text
    • http://diodelumi.com/ckfinder/userfiles/files/kitilirufikugeredatokewiv.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5008cf5aee412bf3e6683ad47ebbf47d/rukimorugofepe.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910408d69f3---2749132.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/26543948934.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/18749037737.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06ce0f3258---72887947763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=simple+past+agenda+web+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 15252 bytes
SHA-256: 0e49d0b40b7f1f21e98ebcfba3f0a034da39249d82725780f1d64e34ed879703
font_01_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 10920 bytes
SHA-256: d178e9a59e33febead9553933b7ae73e380bf7ca6a464ac260349e3a484bf422
font_02_sfnt_off00011880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1