Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8736dac746de8c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 01:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 69d22d0f83944eb306092fcb2d3a8d6b SHA-1: 3d0b57ea8c9e3f09d2bcb5844fd2d6517f93a96f SHA-256: 9d8736dac746de8c0f2f55620731f6a89ca85c4647b37d3d8e27eea7a2d2f472
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ddshower.com/ckfinder/userfiles/files/gofudoweduxelaweg.pdf In PDF document text
    • http://sakesushilakehavasu.com/uploads/files/xadijogiwibebesutegidafar.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109080651493388.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/91416922701.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/22203554360.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/tarenixefipi.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/f651b5b1af1f08f26c41fbe387c62597/fowupari.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/gipezebexopipatokulof.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/60325122234.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/zojet.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/93523991309.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/lumuzop.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021912122165384.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210914083825.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/vawakotafilefopibafotiwa.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161354f215ed8f---vezixufafovo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6fac1eb8b---94373734198.pdfIn PDF document text
    • http://e-menu.hu/editor_up/25298430411.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021959453412.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/73741658790.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/86730055349.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/49303928195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=rom+root+androidPDF 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_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 17684 bytes
SHA-256: a5d678b2ae75e5fb1253948fa4a20e521f93faccb98704b844db4c3b249f21a8
font_01_sfnt_off00011076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001288d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288D 10108 bytes
SHA-256: c18c19f8ddb31095f17b3a7951724550a281c81fdcf2464ecd72ffa565136939