Malicious PDF — malware analysis report

Static analysis result for SHA-256 2155b66e7c25d215…

MALICIOUS

PDF

90.1 KB Created: 2021-09-19 00:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 047683c94efb3c36e181868edd25c628 SHA-1: f9adbd4d67c7eadcc0d3c59c75a32e061af441ba SHA-256: 2155b66e7c25d215c6208dc7351f472edce5671ca8bbf120433ed9980553e8b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=charm+farm+mod+apk PDF link annotation
    • https://miguktour.com/FileData/ckfinder/files/20210913_0EFF733D9B74C67D.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146531f59429---masaginupujavadosuji.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/konup.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/99748557747.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210911_D4FAD92DDE5680F7.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/jikerapivebaj.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/xisasuparubulevi.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/natenebodezofi.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/86da6f50a3a32236079345d30a4a92fd/natekitorolupunoxaliweb.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/zupezefanevud.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/bajis.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/16403391474.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/4045bc462a10c2bf7881f295e5044322/99137816726.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/gorixe.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/kuputanesodazatutaruxa.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/gamazijitofupufa.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/47339244121.pdfIn PDF document text
    • http://byecook.com/ckupload/files/napitipepok.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/maxakikalavu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e5ff2f336239cbeac8e7c233785bb695/venepavaferos.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/sekuzusodadutomuronenukos.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/tegolo.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/bubosajuzejexujamep.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/gajepuwogipopoloniletadi.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/6662600602.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_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 10248 bytes
SHA-256: 45f10979ab95198e8608077b1a22b8ab48383a22b7600f376290ed17a8a234a7
font_01_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 24692 bytes
SHA-256: f15726fa4a9c10f187a836aa866597281070f99bbdce1393d8805e5f28084936
font_02_sfnt_off0001426e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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