Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21cd0b3ab9a5dd7…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 00:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e23496e62c484cbbf58c61621f356e9 SHA-1: 1271c49262ddde858ea6f493cbfb11a3716e0299 SHA-256: e21cd0b3ab9a5dd73be2847f6f32387605c1fba469963787659dc1e03ec991bf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dinskayarealty.ru/media/file/26350558406.pdf In PDF document text
    • http://netmutum.com/userfiles/file/74582079408.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/tarij.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/61012261784.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/pezusafagowidezetomejaja.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f265ad40e9279ab01ef60b793fe81fa7/74016541400.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131bac241029---6004444574.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/81636844523.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/88124237812.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/94072416292.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/83ca2ed3c29368236e767c5eaafce903/kimalu.pdfIn PDF document text
    • http://sksound.com/userfiles/file/nosulafatozow.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/49508998880.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/38717542303.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-3/20210903050108797464.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10178414579.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/soxoxenisesosexa.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/74304376641.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/lilidakonaxozosoriva.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/17799380540.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/xefemefufivug.pdfIn PDF document text
    • http://lblussana.it/images/file/74805395263.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/75550426785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=123movies+white+house+downPDF 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_off0000b612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE24 16028 bytes
SHA-256: c5a0a8ee2dc0ec4a082f7f825224af5731f32d8bc616b20c4501e10aa7d98af1
font_02_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 10704 bytes
SHA-256: 57d5ad4cb437c5f9224a011873d84d8c0fe5a24b871b3efe50300e1708bc5352