Malicious PDF — malware analysis report

Static analysis result for SHA-256 3994da1c0c69e327…

MALICIOUS

PDF

66.7 KB Created: 2021-05-20 11:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1149da1d2b078867a637ad4d465fdd66 SHA-1: a9ed1bcbd9d5a6538cca6914982f6c30f576750c SHA-256: 3994da1c0c69e3271611a7ddd054407c48a39970ccc9000165f906463eea94cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures that often embed JavaScript for redirection or exploit execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca92dd0aa---82969224168.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8be33fa34---nelevudorabomepip.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609a397adba90---19225252585.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16085cef60b425---44983235995.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb75c82c57---vakazuxugafimukiziwijesij.pdf
    • http://keralabiblesociety.com/fck_uploads/file/85960978369.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6fb300237---wovemobebodozetoxed.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160949d589b65d---29570626998.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e08fdcc2dd---wojemodudejezoguborerus.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/eedbb3934209f302714c468a4c8f7ecd/wosukovureponitosawipan.pdf
    • https://emmaushuis.org/pages/71268248798.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/4d0i9rc8di9b7bn8rq2uln7fpj/vozibumejigopa.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/685fe33a4cc7f1789ef51b9279ca12f6/xutagopodedogu.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/998d2db674579bd5a30a50c366365f9a/rafolugoguwawokezifaxelo.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219258badf---fitasipawi.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58559f2841---baluzuforiroser.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/1f0e26a0f84a2e67e6d6d5a7e5169429/jegonimalazozumuwanom.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/l09lgicbg2lvtq7ec7df6jpog4/godosanomojuninejawonal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=daily+language+review+pdf+grade+6
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cad3.bin
59af69ced4da794fdf6a3eaf5d0ba727bc9f494091133ba9b498c9578ef2d62a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD3 5436 bytes
font_01_sfnt_off0000dd8d.bin
77dbf1b4aa62c6b3ed41ab0f5f5a9e8aee640659b774059b57a9f5ad6a75acae
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8D 10092 bytes