Malicious PDF — malware analysis report

Static analysis result for SHA-256 312d745d0c5d1a72…

MALICIOUS

PDF

72.5 KB Created: 2021-09-15 10:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9da7c0edaba395b41606b830d5ee8e95 SHA-1: 13b9278e9095c043034f251ddeab4abf08dc895d SHA-256: 312d745d0c5d1a72e69cd2fe43c1885948a67656be21a221522d2f40816c1fff
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ghibms.com/userfiles/files/27604046854.pdf In PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/bowagokub.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/fopileriliwobepuze.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/sutunuxomitum.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/98335661848.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16140338aa3c3e---sodogigip.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/85153120155.pdfIn PDF document text
    • http://hk-keber.de/images/file/53203703727.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/169af78879c1c3eb98f72b4c47b4f84d/73352426402.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/gafewuvas.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ae94fb64a5222cdffbb9ab97a1e212fa/nigelamepajatet.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/nanavurenuropekit.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210905092957.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/4053482868.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/84127406628.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/xekojejiluxufanuxunowo.pdfIn PDF document text
    • https://phukienbep.net/media/files/45794054218.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/juxegalosajuje.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/58610875613.pdfIn PDF document text
    • http://jar-ted.pl/file/45515587912.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/d37d8e06ec1abace9e6c708a5ce78d02/pifiwisuv.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/7443107474.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346ab51fb2d---26867467619.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/woviduf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=exoplayer+for+webPDF 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_off0000bd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 10316 bytes
SHA-256: 5b078a2c1d2a9ba0ff45e76f04cea28f24bc0581a46d3b1ec6278437cdec7226
font_02_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 15944 bytes
SHA-256: 317538e1edb88689651f7d82e0b7299a974203bf4a21cf915136888100f28b7b