Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce59990ccdc70cbd…

MALICIOUS

PDF

88.7 KB Created: 2021-08-22 00:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77d86d45df2091e587efb4c1e16046f1 SHA-1: dc07f54739a1676e363988063c77257867f37c5a SHA-256: ce59990ccdc70cbdfd6f3931cf7814ad75e8a88b6fbff59fa772b19e27bfd247
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to PDF files hosted on compromised CMS uploads and disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://avandcie-energy.fr/ckfinder/userfiles/files/gasuzetoweleke.pdf In PDF document text
    • http://www.nomorcantikjoss.com/file/74199363800.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/kosibovesom.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a42dfb9ec10---jonuduwizenobep.pdfIn PDF document text
    • http://capital96.com/userfiles/file/43723881830.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b643ea129---80856815204.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/kixavatajede.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/bq98v87qdsva2p6k9b3rr17fnk/54675037706.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f4148878e---44101549153.pdfIn PDF document text
    • http://blackwingsexpress.com/upload/userfiles/files/6541942660.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/28245908365.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/notomotiw.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/cfbec5bb0be3a8abdb921031531057d1/delokotomazikoguxanu.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/eb4a8cbc943ee8ee808154c92d05a7d1/vumapazudekewafadaja.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/bomulabuzusujokeliwupaw.pdfIn PDF document text
    • http://naviway.su/upload/files/96447716080.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/gavesipasewofodenijev.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/nizilukijalu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e98d4cedebd42caf01129b6d8f6c0438/28108918075.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16112cd71d0873---84539612452.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/lcp0sabpkf1hft6n3p0p4680v5/xifarobajoleme.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ripejefar.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/poxebulagar.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/weloruzugeniwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+questions+to+ask+during+a+project+management+interviewPDF 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_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 16444 bytes
SHA-256: b4f849e53cce651f57ffa751018e0cf7773f3aed1b851ec90d4be8c17b1ec78b
font_01_sfnt_off000120ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D1 11528 bytes
SHA-256: c23a3abb3601b6aa9eed99d8191529cd85300d213f168723efabe3ec3dd3f6cd