Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ebc0b85e201438…

MALICIOUS

PDF

91.8 KB Created: 2021-07-13 17:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e58a80422b5479d690be688e5f559c6 SHA-1: d1fd3acc0cdfa8c019bb58b6aa115d41ff7dd6c5 SHA-256: e0ebc0b85e20143862b7bf257626c7ddf79da8275953d302b91409efbb767779
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm hosted on compromised CMS uploads and disposable hosting, with numerous distinct hosts. The embedded URLs point to various PDF files on these compromised or disposable domains, suggesting a phishing or SEO poisoning campaign.

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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d12c7f807262756dd6f96b957a2b324c/27228862768.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e94187baa71e7646fa79f643a3f6d7d3/25154565942.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/tefojepakimovodutumirasi.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-24/20210524003412599842.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9652e50ab4---vadixu.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/7f6b92170b46e35ea6b8dc27e032f0a7/72923030182.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/kabozawetuf.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8baf0b3a89---semukebaxoxiramokipi.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/sutosibevivudediz.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/silul.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b4ff98ffe---74885384790.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1c271517489d0f6dc753d395078de880/95232051172.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/45511258149.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607829929a61b---topiwebetimunisesevidako.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/18798290079.pdfIn PDF document text
    • https://go2germany.ru/files/file/94892607781.pdfIn PDF document text
    • https://ancoraeducacion.com/images/melobifamapajaviduzaso.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/vuvetagubixoxoxekixejo.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/sabujawivesudajototuloz.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/15175586266.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/75237968a044e5c440c32087fb530d7b/peforezepiso.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11f7775946---mozabosigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=signs+of+increased+intracranial+pressure+in+dogsPDF 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_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 10972 bytes
SHA-256: c85076e9c0e36b21eafced047bf08dc05faba8860add741380e7aac4087e17f4
font_02_sfnt_off0001349e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349E 17132 bytes
SHA-256: 002784add7001b6c8f761dc5b0a0e95ce0e00083178948f970d4d5559d40dad6