Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c8f4b1976b89cb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 00:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52fac0ab24c623cfaff19a5bf533acff SHA-1: 4e6d43e999aaadbf45c364e341abf30586770127 SHA-256: 61c8f4b1976b89cb21966295635fcde18c06c8f36996435bfc1ab0345673ea58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload storage. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=lively+wallpaper+for+android PDF link annotation
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325ac1d03f8---92946877924.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/55138511737.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210912155321.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/73463736392.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/86510945545.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/89498195708.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/kimorasawabumezenimunorun.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3531c4f1621949a505588f3a9708c733/23524517225.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/vukumuroti.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613101c0315be---vawaredokejir.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/93824475440.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/20039494165.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/70445300904.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a01a225789---xixapirazokuponevuf.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/83970271033.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/11308170849.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/70136259171.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/55121886626.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210905095743.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/89582320699.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/81359786362.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/48396663325.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_off0000d5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A9 18196 bytes
SHA-256: cbc55dc2921370ffec7ec9a77aeec01dc5d2033fdb9b50306e7b5b31467a4db9
font_01_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 10448 bytes
SHA-256: de6ba7cef8f16c63b34ce1a46828f0e7d3e3c9e885588af0a931f82cf58b79c1
font_02_sfnt_off00011c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1