Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa812562745907c…

MALICIOUS

PDF

85.5 KB Created: 2021-09-03 18:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1da122ea5a5dc5503f8954f0bf45a98 SHA-1: 526f973e69ceb06ab9fe27a79d2ab25ec4eeaf0b SHA-256: 9fa812562745907ce9ebf9d891b353e9c03fc82f1cf0d7cfe405589379e87eb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sardavetri.it/userfiles/file/6393064406.pdf In PDF document text
    • http://fst-uinsu.net/userfiles/files/xemaro.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/58eb66046a251b02f57d470917c99854/tepupuwikewesa.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/18681632571.pdfIn PDF document text
    • https://medius.sk/userfiles/file/97439861705.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/35529204142.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/4c3ad44864b51f2f5d999a7c261d006e/xuxemurumiguwozeza.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/65270381064.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087827bae9b1---rivop.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6f9679e84---81309283123.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/sizunawojisubogure.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/65796194961.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/ed9c8110fd3fc7032847664e24cfacfb/vuwemi.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609aba3f5d1e8---bemumizizutaledoru.pdfIn PDF document text
    • http://pjteam.hu/uploads/570407198.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/224977062.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/lidifewubitofunawoxem.pdfIn PDF document text
    • http://potlista.com/file/files/7600092195.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/5699871584.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/30585e4a1066f2a12100563390dd4ff3/kabusozu.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/luwoxigebipilelapubu.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/93209474334.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107240401209876.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/46948116776.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a9514bf3c20d2a0e74f9ad6fd3b63dfd/fafowobadada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=wps+office+2019+user+manualPDF 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_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 20252 bytes
SHA-256: aa3d74db264e89ce1dbf6ac7dc26ffaf71bb101f55987ff204d4bab377a8302e
font_01_sfnt_off00011649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 11100 bytes
SHA-256: b9d0b356c5f2e392e5084d5c01e5bfc9a12abd14058393a8c63a428acb3539ea
font_02_sfnt_off00013044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1