Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2237e51d8e1599d…

MALICIOUS

PDF

68.8 KB Created: 2021-09-08 11:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 239ee9d47d071d7bc26a4b5ee90340f4 SHA-1: 96edcd662e9e1d76e63d32e52e844859cfd153d0 SHA-256: e2237e51d8e1599d685966ab8baf79951af44f9c0e402212842d4c696d465256
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute further malicious content. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were directly extracted, the heuristic firings strongly suggest the PDF's purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://amoy-art.com/Upload/file/fajarilomimopulumo.pdf In PDF document text
    • http://maychamsocda.vn/images/userfiles/file/39697976513.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaed655ece---xejixaxutox.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/79857217186.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/3068824905.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/53749647277.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/wizoxulu.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210717171039_1358324418.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f12268bb64---1641910650.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b64406229---68042782572.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/529583d02e28046e381a854442bff59d/buged.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/julijezap.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/fagixidesanewakodoteri.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/vafunikexowiroja.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/75d8bc8dca20690e6be0adcc2b3288a3/64075774366.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/pibixagisepow.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/27690402232.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/gelasaxezoxiror.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210828/files/20210828034331.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/615843a066462d392047052061483ea5/kinikidewabivaputexe.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d6983ffb---rikesonunateg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=house+vastu+in+tamil+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/92877533198.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_off0000af74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF74 10716 bytes
SHA-256: 5f705c586c723dbe07da54a27b977a2fa3b4e7fc4502c4fa14fd5d0f0c5debc2
font_01_sfnt_off0000c801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC801 15280 bytes
SHA-256: 7a70556ccb6b4d2b8a036bb68fc9774d0f736c1eedf2c9a1a4e9518bb18d0260
font_02_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1