Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57f5728d7d6fa29…

MALICIOUS

PDF

95.4 KB Created: 2021-06-26 10:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 480f6a2cbb2f37e1035c08368f64e6e9 SHA-1: 9175b029a82ef494d5cb96c460fcad213b564243 SHA-256: a57f5728d7d6fa29ae88920835942e0e01fe06c7ae3f2c372a7f5764233a585a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links and the overall heuristic profile points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://aterhesseg.com/up_image/file/19745988911.pdf In PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/bikuxezigamobetulojaj.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/6c58de0a0eb76a1ce6a05070ca1b6e5a/tofixemoditukaguridoko.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8f8c08db3308989b3ffcf03a6e2551f2/gobokakexanofawogeruj.pdfIn PDF document text
    • http://sport-way.ru/img/file/88145568101.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/a624f3586a099737a6b82b51412c36a6/zexigexevemoxesofidufozun.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/biwebilamagipaxaropike.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/1ccef4167a6e30ca2f1c3cf0bdb4e71b/xirebor.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ddec75f5a6aa623c9f6459c2cb3ca964/mimez.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/gapotivejudugelunekodu.pdfIn PDF document text
    • http://simonide.org/userfiles/file/99507292790.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/jijabeliwomexez.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/817f15e7142ba994304d44aa5e0a5abc/50063934693.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f75b073a8b---35477672857.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/fuwopujitak.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a47aff891e7---nenefozobekaj.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/lugamuduresubes.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/04a3f0a59b366d8a9c4a7670a449718e/39190562424.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/9694175475.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6d888db85365e788b3d10a224014b05c/58257321506.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/galoxizikamiwariweru.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/38127547370.pdfIn PDF document text
    • https://geniodelweb.com/file/36189472658.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c2dfc141bd040271d3aa6d495fd771ce/gokuriropovufumurazipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=king+master+free+download+for+pcPDF 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_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 11040 bytes
SHA-256: 0789917118f6a72c8a032061a75ce245e321ba950a002290475946cfce7a48f8
font_01_sfnt_off00011262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11262 16852 bytes
SHA-256: 95e0d4bf53cc53505a0a1ac3832f3b13b5969a959286c77646303ff2b290261e
font_02_sfnt_off000129b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000141c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C6 17552 bytes
SHA-256: a491010f14e8b8a342e11e5c7262b0504e5bd0d36a90271b9b7a0391851e3629

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