Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf49b398da1088e2…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 11:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0166ab80cd5160e4f680632b7f3ea303 SHA-1: 4bf2b972889154c29505abea2122a7e27f850037 SHA-256: bf49b398da1088e22e59e3f9d793960e8842a6091c95fbae9cb80ccbcace1fc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=how+to+make+space+on+my+android+phone PDF link annotation
    • https://cyklo-wellness-penzion-palice.cz/content/mizusipeteve.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/82553221449.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/83728622641.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/lirezakes.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/14818102683.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614619d95f26c---16912898023.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/49d1f1d029e3d6618f56dc7614ab7131/forox.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16130726cc01c8---gokuxir.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/sopebelodixarapanaxebijov.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210905_314EBAA90E9C4761.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/79203324764.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/60066422525.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/kaxalijonawolulowosugoniv.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210914092404.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130aff54315d---18522256473.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/98347341493.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/jaxobowaxikavelagese.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/47628856999.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16141a7d6b76c1---63794153056.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/18176735110.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/25193433462.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/69177590257.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/zomumawimetivujes.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_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 17656 bytes
SHA-256: 515ae6565acf9ded602859bba5dd56fec605ff7dba04fab83ad6ed450f9bbc6b
font_01_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 11016 bytes
SHA-256: 220a47e6acdebaa38251ca7c2d5ac90cb11086a7d7d760f760cd3233931b58ee
font_02_sfnt_off00012cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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