Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e5e2549942b69d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 01:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9bbbb02db0ffddf1159404d720a5f40a SHA-1: 335e0218c4fa3ec00ab0bed8665eb4fa21276b70 SHA-256: c2e5e2549942b69d749931193feedda1dce1167a29106011ad9c59e6f34a950e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which are identified as potentially compromised CMS upload storage. This structure suggests a link farm designed to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bachtungcompany.com/upload/files/60466393278.pdf In PDF document text
    • http://techscreening.com/userfiles/files/xotonujorigu.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/ribaduwepasuvujado.pdfIn PDF document text
    • https://betsin.org/userfiles/files/pazakuxadixiwa.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/dofiw.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/31612314792.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/xelopibaxuzerisufonid.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/32638103189.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/27866515115.pdfIn PDF document text
    • http://change4best.ru/upload/file/zovesore.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tv44ms71olua6npk2uiped9v00/85741488770.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f2002d9396934ff82d461b30287c5b7f/28129324687.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/89037208548.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/23965998326.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/85779962508.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/fakokubumifubolawepejodu.pdfIn PDF document text
    • http://nprofit.hk/userfiles/fajorubibumuzun.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/62815719383.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/73431953391.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea55884fc---zajiwavifofomakivema.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/ralexexixuni.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/nadujafofezowakija.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/1852427357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=age+of+empires+para+android+gratisPDF 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_off0000d337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 18892 bytes
SHA-256: 123e42c39fb23e07c2ad6ad7979544ed076076504374bb9de758566e4ec66850
font_01_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 10776 bytes
SHA-256: 9fecc87fe5ddffddbc9c22dc5c8fb5b65d54735e17ea4a0afe0225a6dc5abfe4
font_02_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1