Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67e9ac1bc1e09ae…

MALICIOUS

PDF

85.0 KB Created: 2021-08-01 22:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad09d544aeb3367c35c6dd6288960358 SHA-1: 492d4cb03fee4ade6cf5bc873fff9326782750ac SHA-256: e67e9ac1bc1e09ae836f98894c3f60ce2fc3c137889f483ecccbc99abf39fa6b
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 a link farm pointing to numerous compromised websites and disposable hosting, likely intended to redirect users to phishing sites or download further malware. The document body is unreadable, but the presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://chasehr.in/userfiles/file/42124920512.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d38cc350---jivixufilesakozirodapasi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/53c6b94992bd7cf0d91d23c528dc4d76/92983285118.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/21110063917.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/besusuro.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/85b8c380ab72fa4aad553ec79b684735/losivupuxulexivozebilabu.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/50341116118.pdfIn PDF document text
    • http://vodnik48.ru/content/file/1039406364.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/00d76eaddb8b51fedd150e91c5587e06/32228763926.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/76795536928.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a33e497532378ab73f4c6b5012019fae/70789465897.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081495b5af2d---jewutikalefikibom.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/u9iabsju98auavo4cj76ld5mt7/35889263077.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093d7ae205a6---dodarifem.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/mutakafiwi.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/79168856293.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/26301426907.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/wenavokijazuxe.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/2060208268.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a52c6b0e0---52431746465.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d365a8290---nevuliparax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=6th+grade+math+equivalent+ratios+worksheetsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 11256 bytes
SHA-256: 24408f87cf6445a17ed1e497c62bfcdcfc5e84f829d50da69e68d2da5cb4a3b5
font_01_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 16576 bytes
SHA-256: a0a3707e6b8be54f7c970a329f973a693c51f2ef2ca4de2a9b6e78207751df6c
font_02_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4D 1848 bytes
SHA-256: ebe37dd088900a1601315ebdbfada4487268e914aefeb097cf752198025a5afe

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