Malicious PDF — malware analysis report

Static analysis result for SHA-256 e522c579cbe2b286…

MALICIOUS

PDF

82.1 KB Created: 2021-08-27 16:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4766c70d0d932b921367c41461b8ffcc SHA-1: e4b6376ab3121cf6c1dd887cd19b0ee07c67ba6f SHA-256: e522c579cbe2b286a74cd8243e0c6d7f6df4f9a8d7642920bcc521aa695223c4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://allytemp.ru/uplcv?utm_term=the+directory+name+is+invalid+usb+windows+10 PDF link annotation
    • http://beastyenergy.com/userfiles/file/gavaz.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/xitipitun.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/76320654054.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/92272052468.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3a686d0c7470e2aea379b5b980363fd6/52401607985.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/25649956853.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/80097597489.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/24946743424.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-23/20210523135308836275.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f110ff2b21---12100903274.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/guruwenixabasi.pdfIn PDF document text
    • http://domario.ru/userfiles/file/71367881770.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba410577d5---buzizofatezariwegore.pdfIn PDF document text
    • https://davaocarrental.com/images/file/92089046609.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8fac8a53d---zawadaxiruxukobinotam.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/rolum.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb8484a0f8---25210348966.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/zebatutesotujidojulu.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/fichiers/63105845074.pdfIn PDF document text
    • https://mbbs.hr/files/virazutuwanoxase.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/41298239900.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/vixasi.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/vv7k0avabpmf7jbr30pp4mkmuu/rotugetidi.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/17252798942.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/11745569251.pdfIn PDF document text
    • 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_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 11276 bytes
SHA-256: 5bc3b26f8ed56c39a38103ca85fadd4f002aefee4254a79570b5f7171ea9ca33
font_01_sfnt_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 17204 bytes
SHA-256: 97c3f47ff576a2b7c356a463c9e485aefba9cd716533c269d4d0735f3e3e6dd1
font_02_sfnt_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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