Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4736cac9e4c5ff9…

MALICIOUS

PDF

80.9 KB Created: 2021-06-14 01:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc1ad1269ee030c1f0637193addd5cc6 SHA-1: 60c2b2f609bac947024fd728aa40810367006405 SHA-256: a4736cac9e4c5ff96048d0830943deebbd03b941f4043c7f415a36b2c718e118
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/uplcv?utm_term=mumu+app+player+pc
    • http://tscyw.net/userfiles/file/20210614055803_gfdhru.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/9fa73a884a7c59f991c5945250d8dd76/vosupupidibexetus.pdf
    • http://xn--e42bt3l.net/upfile/files/73381658947.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a2c4b1e4cca58d48d07519f909f6ef5f/kugesorexupufoxelizakiw.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1af3dc92e7---84066457040.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a26c6860b64---73202759049.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/t2odak8rhoc0rgktnjcgg9vkcl/nobakewuzavilabiwuvidasin.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210607115750.pdf
    • http://evohome.pl/userfiles/file/57918764349.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f98ec525620b57dd51aa5ccb5cfc1d06/xanadafujudizotefeveroxar.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f7e9a0c79187b0352c762ea1f9994f26/7835060473.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/u65qc3faso2h3hknfbr6rtoueu/fapugisutuxawesikatofexud.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/56493658649.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efba.bin
3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 6440 bytes
font_01_sfnt_off0000ffae.bin
535a79e2992dd7284ded44a678558538915eafb7249234303976704d5fe8cf41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 5008 bytes
font_02_sfnt_off000110b0.bin
4ac14ec616815532b0afc14e085975785ca874e043f6ae41ebd9872fa650a1d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110B0 11176 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.