Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3dd342d56f29a9…

MALICIOUS

PDF

87.3 KB Created: 2021-09-14 04:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 412e68f11a86598e3e65f3feab84ae74 SHA-1: 901e014eaa7f9e51e38ae77fb0a3c7f623dbde41 SHA-256: 4e3dd342d56f29a944f6046210941d3c2a5ab0c7b735f5224b049a787f227439
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://emenu.hu/editor_up/duzaxoronanoguda.pdf In PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613550adc9d3d---89268146935.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/mekaduginobo.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/75115307749.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/wuxolu.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/79635202462.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/laropugebidixuxoxu.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219132051444260.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/xibogexogo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4f2f4574cc5ad6ce16f858a0aee63b0f/gakokomonas.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/rojabubufimasuvom.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/99848499789.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/77691810763.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/givivizurarunu.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/89591924477.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/riwewokutagosa.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/42206244184.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/19899900329.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/kubujuzemi.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/6a881f36375a55e64e90d6ca33519f1b/fuwibuwenesuvapakafetur.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/17655611624.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/potakofena.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/66028295687.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/wikomezativafidez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=nes+emulator+roms+for+androidPDF 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_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 10592 bytes
SHA-256: 5b18e07a10d8b1b72dd352c34207f4ddf453a3d80bb94d4d8ba0480eb8236a78
font_01_sfnt_off00010849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 18156 bytes
SHA-256: 22efbd6c7fc84a72ef2afbc8ad85acc2b7e5c4c2d096482d582922f5c39348d5
font_02_sfnt_off0001379c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1