Malicious PDF — malware analysis report

Static analysis result for SHA-256 a865ddffab908cad…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 11:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4eef3d264be124b98049b65d3a6c313f SHA-1: 0575c3696c622dd1c2f130c40406bcff074af104 SHA-256: a865ddffab908cad1d255db26a911f0d3b5e4fda9833948a480bb280f8f0fdaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs point to potentially compromised or disposable hosting, suggesting an attempt to obscure the ultimate destination. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://tasivn.com/upload/ck/files/70774289372.pdf In PDF document text
    • http://csc0516.com/userfiles/file/20210907124743_0sy9xb.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b6321ccdd962d680d6c61021ef92d5fc/pabaru.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/gozifaribokulu.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/6763951970.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/95111153644.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/79406435333.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/kutetopalu.pdfIn PDF document text
    • https://bczenekar.hu/files/file/zelizinoxe.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/43942553075.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ffaa3fe12---kojalanav.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8482e3cc---jolabulovozufo.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/42084881344.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/61429319129.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/poruvadupi.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/16251690393.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/92998204914.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/br3l8qim1rpg49k50n7vcq87co/96035876609.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/fumuwazewevonajaxomedibi.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/puximosakavezas.pdfIn PDF document text
    • http://3q1p.com/upload/file/210905105316134501gstmn6t97hng.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/4610151137.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/vimetipoke.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109090035413341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=amoled+burn+in+fixer+appPDF 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_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 10716 bytes
SHA-256: 03cf1aec2cb8d043973a03a97f3dc253131a3a7c78b7374ac74167c89c3176d2
font_01_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 17624 bytes
SHA-256: c8fee773000825bbc733c4a227e1ad8627067f30d75ec470528923748af69418
font_02_sfnt_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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