Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab5e51304270052…

MALICIOUS

PDF

176.9 KB Created: 2021-06-28 23:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 273377b2e4222ab95b504016f32677e6 SHA-1: 86a2a6884c44a76a0608ade9548fd2477ca49aaf SHA-256: 8ab5e513042700522e081536e951e47a3cdb8d1e76c2c35cd5b748cc48d07e04
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://acudrved.com/ckfinder/userfiles/files/83757998622.pdf In PDF document text
    • http://aceonlinementors.com/userfiles/file/febebawaso.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/fdc555a3468eb999e522b47fdf8fc2eb/jasoxopobufariga.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/mububojajasadopu.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/daxojudomekonas.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/levutex.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c6f81447a---79217374226.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/umt5m21ufb4ia0e75jq244q0sg/zabetaxabu.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/96625439944.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/4067998958.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/dd42a9i4prpkqsne6mkevp7t00/favalu.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f045e99e8---pojeboje.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/12c471042283ac63e3fb0d85103622e1/41110038822.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a736ce2bc82---juritede.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91806129051.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a7951124e8c26b31b84420ca0304f691/vepugamivunometim.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ofrf386qag3b776sst2l8e1r85/23019807848.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f683ec1104---dixutiliwarinabe.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7acbee7b---51938437648.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/37002005812.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/bbfbfb0aac5402a9e98971044be75e1a/83601543077.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/192badd14e86fd08dafd536275f8fc54/zawej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=doctrine+and+covenants+stories+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_off00025897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000270ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x270AE 10636 bytes
SHA-256: 20fb93056d3071d0c84214697804e5cd01fc4cf21dd4aa4b9bef5024902b6265
font_02_sfnt_off00028926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28926 17228 bytes
SHA-256: 6d299d2dd25f0b2e603affbf1ff55d3b83d7256e08fe5b3a045cc63e09d6eae7

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