Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be841291f5c6d38…

MALICIOUS

PDF

129.8 KB Created: 2021-06-26 01:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 136d550a31031dc56890d175cd1b6f2f SHA-1: febbb446fb12f87c2c285852d093bc7e6a996739 SHA-256: 1be841291f5c6d38d4d1828f31bae6fe92f4f89da48603754ff1f5e30ea594b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites, indicating a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and numerous external links suggest the PDF is designed to lure users to malicious content hosted on these external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9713

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://pistant.ru/uplcv?utm_term=i+am+fed+up+meaning PDF link annotation
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a396c00f5db---81591561246.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/3b3e32a5689edf84b7ea3125d25f12af/nefujidazewadake.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/sagoloxanavuseda.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rovenirinelanabopunimix.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xukosis.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/10512463732.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160852ce6e4576---suwipilejegebozovaw.pdfIn PDF document text
    • https://service-panev.com/userfiles/59294116723.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073370714358---mavozaguxo.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ke1d6kmnu4esfsesdc7au2kdtg/kazupodopotudabavu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c7f847252---42934381079.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/wixenesomazizixagigare.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f91da18878---zapebasufojowunera.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/237eb85c694f94afaac60c166bfb1ca1/kumazudum.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/uad57m0j0mjbfhj2cmfvhmeqg5/9831127506.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/t3eqb04u1vj8jrbuhbedkvkgl2/sekonaxaxi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912f642d448---92832894382.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/51333189816.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/90052294536.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/3769189574.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/wefutapig.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/j7lmvrl0d9m3qc8e84m1c6b382/lupupuxusixewadisukibuniv.pdfIn PDF document text
    • https://intellicapital.in/ckfinder/userfiles/files/80334270498.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000156db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156DB 30888 bytes
SHA-256: bf067cb1ea2bad61bd6ca59ca4659e5f76af16cb5e2ead9720652acdb41ded1b
font_02_sfnt_off00019e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E1E 10360 bytes
SHA-256: 5e1067e48d3280f31f21a77b16da5f798638b35badcb066afa0524a20cc58070
font_03_sfnt_off0001b52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B52D 24424 bytes
SHA-256: c4510572b19fa9f62a473992df4d627bea0d6b6e98d052da29e56685f23b36ed
font_04_sfnt_off0001e401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E401 5952 bytes
SHA-256: 879383263a7482da1ab10c02ff9a4ae8531ad546f8ec3e2236f89a5ffa0cab91

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