Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1d83d1c27f9b8d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 14:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44b3ae4a51cd3ba50c70982be4562ac2 SHA-1: c9d84f5109d521a3bdb3d109181dc3be60fc4833 SHA-256: 3e1d83d1c27f9b8d30e6faaa3f2e1f66eadd4d797375a60da43e3b35a8337705
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337bf26a8d8---vagusexivenotet.pdf In PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/vorajeforufavipi.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/49159080678.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/viteguginanopuwusoko.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/62246383537.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/99340780961.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/11777874681.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/8c0d66c264b309ad32bdc330b3aa6e74/mebetogekazo.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/98261934654.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/toxasegizisak.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/lajumine.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/goguwubazepujujowegogupef.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/40673449660.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/671gj3cbjkmddpviq7eiuvvve3/lefegukamosewazev.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/74362391048.pdfIn PDF document text
    • https://akemi.ro/hirek/file/22446023200.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/duxapopa.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/binojowagug.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109120931263495.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/tafomaki.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b76b96e5a---91359461476.pdfIn PDF document text
    • https://mkontroll.hu/File/wuralevaribikada.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/65363585082.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/89955059485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=outlook+on+the+web+sign+inPDF 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_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 18792 bytes
SHA-256: ac5d989b0d19e739eed06198c9fdf4d86f4afb8b029c0137e31cbcde204ca9e6
font_01_sfnt_off00010c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B3 10568 bytes
SHA-256: 83ddccc4a46f8ec77262b2a8b80a017df2d43cbd4c0782e38efcd476888fd73a

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