Malicious PDF — malware analysis report

Static analysis result for SHA-256 420ef8396fdd659a…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 04:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f5575cf15d134561069b8b1a6c599763 SHA-1: d01cd83b580e4d1a9edca13cb7e2f348aa132f92 SHA-256: 420ef8396fdd659a52fefc3027cbb1b02c460007abd15951ccc1e91e45597dd7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gitishahjahanpur.org/ckfinder/userfiles/files/9046164153.pdf In PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e00e6a0b8a7271719d8c81104a7a297c/44660607917.pdfIn PDF document text
    • http://jaika.in/images/documents/files/sedojonuk.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/8148796312.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210505224936_1421749877.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7046e59385---toviveneferajeme.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a88217532---36225901348.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/44447074652.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8bec88b94babebffcee9951c56c64128/xagamamefixanuzunenonogul.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ra4586c9jn6744o3tqs20unmkf/zevitazugudo.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/pagulevunuwederibamus.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612b89f75c438---getisizegeredav.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/43824020821.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/tifefosigob.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/61292482791.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/sijurizuvudorizaxukigored.pdfIn PDF document text
    • https://suruburi.net/mm/file/fejiz.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/72260778760.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/fikuj.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160825f313b02c---94235769702.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/dd7ebe5a5e03a22d3193b9b661ea3ddd/90124935739.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea2da40158---91150312820.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/ovhlkq578g0dbg1dh3oh6q6c1o/rukuvinibesu.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/xewifibapon.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a922662e9c2---98070942750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bank+branch+meaningPDF 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_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 10532 bytes
SHA-256: 27177f3b8d804729bafeb43a1e2a8bfbb2f4c2397ae89159038a991351974a5f
font_01_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 18384 bytes
SHA-256: a365571caad2e76d560bb7b2efc5087a2488c7fc79316ccabf0e2f5b28652f01

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