Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab1d84defa20f35…

MALICIOUS

PDF

76.4 KB Created: 2021-09-09 20:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19ecef0ff58d295ccd052eade431e12b SHA-1: 8737ddd9b030f311db6dfb798bca33ab9e78ce42 SHA-256: eab1d84defa20f3507daa70a42448292a6a612315061fe063f9ba3ec19fca103
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The file's structure and heuristic firings align with techniques used to exploit users via malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://odlingfamily.com/userfiles/file/besabokajapizadaligobu.pdf In PDF document text
    • http://daydreamspin.com/userfiles/file/77336115067.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/digopulelobejebisalijolop.pdfIn PDF document text
    • https://novsport.com/content/File/48369861548.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/ribafexuxizewowotakero.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/taralewifa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef885a6635---80270746412.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/kebivozolub.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/28041490319.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-6/20210906124837282919.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a61ea9d501e103f2613641866314f790/61614962567.pdfIn PDF document text
    • http://erex.hu/upload/file/36218149503.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/wurekewam.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/pugiwevijuwabakemeg.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/zexopetatigokoxexibi.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/94540573285.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/zojixupawovi.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/zajozoxazesoduwixa.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/s01fcljh65m6b1868f31vhlsq1/dalidunatosolamomenep.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/suzakesij.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/mafexuxurapagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=applied+hydrogeology+fetter+pdfPDF 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_off0000c7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DE 17200 bytes
SHA-256: 9c8eb3e7014975757d87e3717ff7a9e27d641e0905b71022d21e33c69b693e3b
font_01_sfnt_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 10436 bytes
SHA-256: 54bec1964d41701e9d883b6a3e05003e11f5331c09895febab7e861e9c1267ae
font_02_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1