Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8c29e119fe8444…

MALICIOUS

PDF

79.8 KB Created: 2021-08-31 22:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a5e4f0b9b59e9643252bb7dd2d18b2b SHA-1: 278a16f5173d212dab8c464e0532be16adbaf28e SHA-256: 1b8c29e119fe84449bbfeaaf99b986e8198c9240f57386ab04880fc69426da4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/62ccc85691af53d2183a7a2a75fd25f4/gamadoku.pdf In PDF document text
    • http://noithatachau.vn/webroot/img/files/bumipuxafidura.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e993ebe0---93001918110.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/50271486005.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/38086554247.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/bupiwaxu.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/5971936718.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607de88705a85---kegesakerexepedimoneged.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/nerilakoxukonabatipubajap.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f3557c2d4bc1d1050e08d9ae31d1162a/sapiba.pdfIn PDF document text
    • http://canadanur.com/resimler/files/ribopotija.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/12b4ef5031b87dfe4aa95765c8d4fd7d/18417441531.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923a9f2839e---15050223111.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/sd7g8vjiflris3aukb44a37i2r/93615149929.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4c9e68cae563564df79961a417859100/89296522566.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/70607978341.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/o49nosikpbipc7hotis3bdsqv3/6752539521.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/rusejigo.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608520d7788bc---44576393984.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/29615061981.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e952216465f---17183648423.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/fixatobezopatedi.pdfIn PDF document text
    • https://parfumzone.ro/files/file/37844837664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=remission+nephrotic+syndromePDF 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_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 10732 bytes
SHA-256: f8187c1086561a76279b7f12e9b51d5ebb48bc5d9a38778d53eaaa31bdd42ab2
font_01_sfnt_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 17404 bytes
SHA-256: 5190b7fb86a1d0015231b1ecfec43d5f0088a7387fd184e6f8e2b607aca3b01b

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