Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bff28faf8151e87…

MALICIOUS

PDF

77.1 KB Created: 2021-09-16 11:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47fdd8ce710d5faed5ac66b3266580c5 SHA-1: aeeb46913881c5b7f692654cee5e13f733dced79 SHA-256: 1bff28faf8151e8718fbf1d7ed7675e6edc5a49aaf9800d31909738869cd9ac6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the overall structure point towards a phishing lure disguised as a download link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://oniceh.ru/uplcv?utm_term=criminal+minds+season+5+download PDF link annotation
    • http://old.smartplus.pl/ckfinder/userfiles/files/43484859844.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/kexakowujurebux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613289c703d61---geganijijaf.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/15649305692.pdfIn PDF document text
    • http://viettruss.com/upload/file/viwixotometebukaxit.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/wiwij.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/96928060767.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/xodiwatemigigoxunux.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/kirulew.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/jemujo.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/94205741509.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/68cf6ec7bed706cf050a9c4e233edc65/pevuvuloj.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/fojararurusiniz.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3dbe5d1a2---43016651225.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/kelakawe.pdfIn PDF document text
    • http://smirna.pl/files/file/70266899368.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/58944455975.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613033e6edda8---jojigoxorojijorivogajex.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/77363084713.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/28897910332.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efcb2576c4---28765590179.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/19843281681.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614146e06e25f---gafelojuvuvofowet.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/boveja.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/nivadeloji.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6852212528985da8c2b9461ae4a4f15f/75028049616.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_off0000c888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC888 10560 bytes
SHA-256: 0714161aa558c6aaf66986ad284c95886b8e55b069c377ca78fec9d7655b6745
font_01_sfnt_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 17512 bytes
SHA-256: eb7a32fa1f61f082e9b61f1552e1a2aada831b840509732262aefa208547faa1

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