Malicious PDF — malware analysis report

Static analysis result for SHA-256 3891b5f09176b244…

MALICIOUS

PDF

86.1 KB Created: 2021-07-09 05:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bb191b57804d1c83e3c85e22d115de63 SHA-1: f3493d44f7c8b70354e44e8fdab3e46f35c3e3af SHA-256: 3891b5f09176b244560bac74fb67d25e20e0e7de93a43d704303b13973aa44a7
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress upload storage locations. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://vipnjl.com/userfiles/files/807109623.pdf In PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuwesire.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/gigilirokufex.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b856fb116fe---57473873737.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/12158868364.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6a9dc08ddacd00448c376c96491be74b/22501731405.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/60102629333.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e6eb07ceecc---21754459992.pdfIn PDF document text
    • http://teplospectr.ru/images/files/79419929450.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/78d9e821d47446bcf413a1ae746a5ad7/56841909009.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/34ddb7ff002ff8d8960f5e5a91c8ec49/lofaxuronuvigabefixupozi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hnkm6cjh8jgqgsbshpml00drnr/13228901360.pdfIn PDF document text
    • https://songhong.info/userfiles/file/lukaxojegubirafidisonatif.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b894c03c860---bizopazazo.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/56377815931.pdfIn PDF document text
    • http://nprofit.hk/userfiles/nufefizokirisof.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a531d30165d---tisotubewifomana.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c8b1b01987e98b48a361c3e4c508f4f1/jipadi.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c59669935c2---ripemalurafezepunu.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/nadikanosasedibin.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/67336414830.pdfIn PDF document text
    • http://hongdacable.com/d/files/26676626738.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/4edf7cea97019d90e941d9f57c950dd1/xeduxogoleturususuze.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a1a09494e0becd8d81ee41cad13c1b7e/pesutekokutakulofugoxof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=guy+fieri+stand+upPDF 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_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 17744 bytes
SHA-256: d1e1df001ed9caeba1288774ca3843151f059902fe76bce6f8419e5770a42340
font_01_sfnt_off00011b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 10576 bytes
SHA-256: 880f0e270275dd126e3caaf4225678a67360754f4897948b6899e3510aff1484
font_02_sfnt_off0001338b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1