Malicious PDF — malware analysis report

Static analysis result for SHA-256 544efc72b913bc0b…

MALICIOUS

PDF

314.0 KB Created: 2021-09-08 00:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 5fb00200411f499a972d66019af417c1 SHA-1: dd74b7aa3ceabb758d8d50284b9dd6e168fd7442 SHA-256: 544efc72b913bc0bd6f53f4bc248aaab11f6cb6c879d1a3edbd4ae8baa55d4b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9675

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=instru%C3%A7%C3%A3o+normativa+inss+77%2F2015+pdf PDF link annotation
    • https://perfecthospitals.org/FCKeditor/file/83921694684.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/tizedomipopojejasax.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee19e6367d9---ziwenegilakapafeloga.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/qqg2temfah4au2afv1l23jh4ri/48678922627.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/46244051085.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/50674710780.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161011d5abc8a0---gujet.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071546659ed0---9183933952.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b86700628---salovosu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086274ebb7de---48053875525.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/16914455964.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210821092904_zh4bxk.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/sozugad.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/kebujewejetugu.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/jezetazelebugunufuz.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba212a77124---65544214723.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/dee6aae99d772d924726f6a51d032cfb/26432076118.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/70629864693.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf09b3942---665441878.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6e6ee99d7---89826547276.pdfIn PDF document text
    • https://xigmatek.com/upload/files/jigewiliwimimamimizegabu.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/tixesisexijuvabufok.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/sepodutit.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/kisabowipodudamazugi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/cr7g9p4qec2s55g3pdghbksj8h/bigidi.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_off00046a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46A6F 22780 bytes
SHA-256: d029654ccf2ca28aab596e709fe2860101672ad2a6a3d2faa3cfdf2947fb1bc8
font_01_sfnt_off0004a37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A37C 11576 bytes
SHA-256: 45f08e191dedd455efd71b3a3b4343caf939742e025df3dace881486099c1d06
font_02_sfnt_off0004becd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1