Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a9c9e1d83be397…

MALICIOUS

PDF

75.7 KB Created: 2021-09-20 02:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1c4a91ff33a972151c9e858aa2bcdf1 SHA-1: f89f26fdf99251b6ef7b17984d792d112406011a SHA-256: c0a9c9e1d83be397841ea654f2750330de8852d4ad20b579b7f9523ea271afa0
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The PDF also contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.bevillelecomte.com/ckfinder/userfiles/files/93424718079.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/433519f1c508a6364dcd627bc5b21c3f/poxafesavotedu.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/kujazudiguligekofapiri.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/31307778186.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/30751283023.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/tagavometevuz.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/98269118191.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/lowesiruvujiwe.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/zarujifejefisuno.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/78259536215.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/34934963969.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/70619262593.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb50579204---75366939877.pdfIn PDF document text
    • http://reichspfarrer.sk/file/21373980973.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4a48c670f---woxadonajuzebukad.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/32487375603.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/86255952383.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/35988242652.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/vadugaloxu.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/robegaxiriweza.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/62417816304.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/tizinada.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/20040384791.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/45449297938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=free+download+mobomarketPDF 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_off0000c6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E1 16568 bytes
SHA-256: 2f6b38b49b6d69620b7b0198e3fee531db8c7dfa174979bff4f98e6444bb7300
font_01_sfnt_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 10444 bytes
SHA-256: d86da8d44be42065dab260ed3ab2f52ebd15292605de4e44486ac89b7449c8b0
font_02_sfnt_off00010957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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