Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0eb95c8605abce…

MALICIOUS

PDF

102.5 KB Created: 2021-07-16 02:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f586cafdd033bad1d6b616482d6bb9f3 SHA-1: 747b3c1b1628024775ca7eb0b001727adc1efd4c SHA-256: 9b0eb95c8605abceb1a3c0014107f2bc88db54474d66e5826e06b66e36435de2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to obscure the true destination. The PDF structure and embedded links suggest it's used as a lure, likely to deliver a second-stage payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://www.halpellet.hu/userfiles/files/37563425317.pdf In PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6e42b52c455c1b4912cf207519e3e9f5/fozusofajuxorobalatoto.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/19147689856.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01b94392bd---gosukatalumijosuvalefe.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/70626375934.pdfIn PDF document text
    • http://vanhoadautu.vn/static/uploads/editor/files/84126592422.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b73ad63708---20070348524.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/36931220178.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0ed65a257---jegopegigixigukutidex.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/gcbnl0jm81mkt7jvlt2mgclgme/babur.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac24d9a58c6---voxixix.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/31214239401.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1fd43aa3---18367875908.pdfIn PDF document text
    • https://besteva.com/upload/files/bekabakunanapuruwufo.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/96720472293.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/50978597862.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/nakazerikazej.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609859988e0d0---juwusatiwimugiluzubazobu.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210511102231_324328018.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/mupajowo.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fde9d8d7d2cd6202033dff7e8ad3d955/47458283559.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/87146747632.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098289294d86---70341664694.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51b1914cc---82767620254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=toefl+question+paper+with+answersPDF 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_off00012cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBA 10752 bytes
SHA-256: 73cd8b30ffef9ddfd34d33dd4b62c8db770b4c3aabd1ac8fb686ddfdea4c7029
font_01_sfnt_off00014578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8A 17940 bytes
SHA-256: 64aa11604e09f8c99367862508504e2b7fe09624fcca0f601fabaf4f8e922c28