Malicious PDF — malware analysis report

Static analysis result for SHA-256 f074fb54400027cc…

MALICIOUS

PDF

73.2 KB Created: 2021-10-06 17:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0d0d61d09767279792c7f0f0ec42563c SHA-1: 5c991f332aa7f90e9ef733596d3e38b60fb80a8b SHA-256: f074fb54400027cc73d015f3273a4117c44d3e55b79d9faaaa8eacdd7e73f907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=best+free+macro+camera+app+for+android PDF link annotation
    • https://soccerauquebec.com/userfiles/file/nutivomexunaniluguz.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021092113445982.pdfIn PDF document text
    • http://poultech.net/d/files/30370734729.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/64892232616.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16152cfb34f202---70829969940.pdfIn PDF document text
    • https://braus.uz/images/shared/file/bofixixogemi.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/fesufapokitegumexuvatan.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/037ea5daf4cbdc789d768bae4175acf2/wapupozuz.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/88075853795.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/bagisuvigoresunefi.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/79144652662.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/gozijogubepalupiwiwoji.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/22527119052.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0919e0ad5---livakabeworejewutuxigo.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b502d6e5ab---xakobosufowe.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/66927127455.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/josudimumevibogita.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/sedesuropamatafatabefow.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/7860016921.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/zatebuwot.pdfIn PDF document text
    • https://mlspoland.co/files/file/4047425840.pdfIn PDF document text
    • https://bdata.vn/upload/files/15590530661.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_off0000b81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81A 18076 bytes
SHA-256: bbaeee608f4f77882a7174faabd9a4106690c164be17e02b65344b1f8bd5802f
font_01_sfnt_off0000e6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 10788 bytes
SHA-256: 795f6488c4ad3bca46317510f2ea800eef3b19825d90907bb4e84d4720cb53d2
font_02_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1