Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eced6f1e261806c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 08:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c576b5d608414654bb9dbfa585a32873 SHA-1: cb4655316cc44fbc05b724c000d784c11ff7c812 SHA-256: 2eced6f1e261806c5b6d0d30c883419f0eae58ffc0bad1d55d21bca71b9f906d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains a link farm pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure malicious destinations or distribute phishing content. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links and the overall heuristic profile strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://innotec-industrie.be/userfiles/file/51937164178.pdf In PDF document text
    • http://jjinline.org/file_upload/file/maxevu.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/30723733523.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613269e839cf5---lusiluvalajidowejuvot.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/peruxofudox.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/36195037558.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/xokufitagipujebidivepova.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/05080f7c236624aed73cb4c16db73b85/biwuf.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/rusigifagaf.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139357c179e9---92232840919.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pie07cr0qikj4ot4u9fd44v6e0/87613150648.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/95005841767.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/97513709757.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/tedatelosekonak.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/1v8oi5qr1j266060hc0g70h5k5/gobarituviwesigakupanuz.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/n23pr5sdjmd5irht07mm9rsgeh/44453882308.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/81724668007.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/74213181054.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/mopesow.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/80366853629.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/4kumah71aei1cjbs8cghaplsn2/xomenejoxomotoxenebigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+call+recorder+pro+apkPDF link annotation
    • https://lapdonline.org/file/dogevagixelaju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 17184 bytes
SHA-256: 81f9a53ecc332cad4f72077d0d12f7571861351206077144b854c668b2c002be
font_01_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12177 10456 bytes
SHA-256: 7f5b2d5bc70adedec0d7fea0888494faba80bcd695bdf3bf9247ec04ef68ec0a

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