Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5c096d23ef41b0…

MALICIOUS

PDF

115.5 KB Created: 2021-07-19 21:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 69d6e9851361046221d588712cf03ce2 SHA-1: 25962854eb7e07879ec0e598cf0e1c99caee3975 SHA-256: 0b5c096d23ef41b0e5f338e1b5a0a71c32e3ee97c537dd004165af47c1c2ffaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94504a93d7---foxanedo.pdf In PDF document text
    • http://unipsyclinic.com/userfiles/file/20210509173556.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/zesajixexexujat.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/50cbad4949993a8e6c2dcf9398ed0317/79380291035.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wusamamunaruwa.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/sevol.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab04547809---luludutizan.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/56017862463.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072561219e50---vifejofodu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/87eo3npe72tck5u57531dkkp43/jajivanesimamoza.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rag6v2d9g7leai6f34ba7p497n/rirogig.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/p4rdr3i4ct3vbv0gd059hkiu32/56210794212.pdfIn PDF document text
    • https://avenue102.com/uploads/file/setipumuru.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/cce4eb1da38fda0a4c6ea61a752b5899/67277234016.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e0cbc864addf321c4d050cd24d3a6695/92391111380.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/98882799064.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/2d2c1b051b74a04c92ed167ceb958f1a/78689690303.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/pgh1956sjnrofmhhs3hur8b0l3/fopuziniwoviv.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/8dkt62vrbl7epahphhn94k5gq6/sonevi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f95e733cf---39028373405.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160972443cae02---nipitatur.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/cc4986d10e378f9cfeb7350d6210fafd/jifobazelutodidovejimoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+many+characters+are+in+the+hebrew+alphabetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14929 17076 bytes
SHA-256: 9fee6923d1dfd146bb03c5dd22f9869626d4d1c6082cf42cfc3165622829e91e
font_01_sfnt_off000175cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175CD 10968 bytes
SHA-256: cc6ea899d6dd82fcca8d29f06c4d99bd4039a5167abe1b09d45f3fdfc7e248e1
font_02_sfnt_off00018edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EDB 17180 bytes
SHA-256: 15ec6ca19942bb99e4982982892472fea2ee8d8234c99da0c65681f18bff51fa
font_03_sfnt_off0001a826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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