Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cba35b3627a592…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 22:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d89091cbf72d7d823d1138a28efe47ce SHA-1: 7534981670953fc49bbf756ce47222c07f645e8e SHA-256: 92cba35b3627a592ed087fe2994ff183ea6d0f77b0da7cf5839648821a37651c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/106a330da6811c5058a5cbc955d4c1fe/laretilafitavora.pdf In PDF document text
    • https://acryl-bg.com/userfiles/file/70199267497.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161321ea95d6c5---66336783045.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/pirulitazi.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/80676276031.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/90252645211.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/fubamolizesotiv.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/92499456633.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/45855250978.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/kevovefixo.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/33562879022.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/84231467299.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/69916474073.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131c603979c0---rowufevemi.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/56460326812.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/76416882368.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/rigorixupivunuda.pdfIn PDF document text
    • http://farmina.ru/uploads/files/39299782711.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec5527aea0---81443689016.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/komaxefawamelivupu.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/xojixanabebikajodovuga.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/laroduminijakifaxukapekex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=game+evil+lifePDF 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_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 9892 bytes
SHA-256: 48989f13fddf9081e3e11791844cf8c5d21030f87b59fb9f69c9195b1f8a024e
font_01_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 18000 bytes
SHA-256: abd67d557b22a8a10822c8c4a704a07bb253305b9a76c88c005cff02b503fb9e
font_02_sfnt_off0001244c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1