Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ebfac20f84657f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 00:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6d2b68bacff428e6d2c6679264cdf0c SHA-1: 0aa509250ad145b99db88e78b2107e87a0118c3c SHA-256: 52ebfac20f84657f1d9c834c8620341014f83e6b241d9ec449dddce772776414
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. It contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or malware distribution, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=iliad+book+11+pdf PDF link annotation
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/6bc881ffd1ea69a3ac55a66fb660e7cd/53529191826.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/cedc0deca69d38e0cb2fd51b7ca156bf/54600468403.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/fukalupure.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/daf6ab1762fc01bb06ec03c202f05fe5/72372430765.pdfIn PDF document text
    • http://naucseto.cz/storage/44530925580.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/figurimamujekurija.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/62709694425.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/radekili.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a114d27931c---40009255998.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/45115328451.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/gakiranazavasobi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16084e16665b9e---84020770628.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/todaxanulilujazavomejunej.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/nivusofevaguvenibo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b99b5dc8fa3---75969980085.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc820cee6d---7745882390.pdfIn PDF document text
    • http://floramarble.com/uploads/manesigiboferujiji.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/gadudulenilodozejaxewij.pdfIn PDF document text
    • http://waypl.pl/upload/File/23818615452.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/33032204139.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/tetugowoxokakos.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/kipofigamebekonaragimufen.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbc5145fe93201d5ba19c5ffecaba8f6/birovumosupuju.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_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 17776 bytes
SHA-256: 294d267301c8eb21d5428a1cfa2b5873f76aae9e9449c69859cb99494a02e74c
font_02_sfnt_off0001257b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257B 10124 bytes
SHA-256: 6118eafe837b56221005b34830b6794b6d50b73e324c3172a1b14ceaf5b0dd26

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