Malicious PDF — malware analysis report

Static analysis result for SHA-256 196962ec2a8ee070…

MALICIOUS

PDF

106.5 KB Created: 2021-09-05 06:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74833aa0020dd60cbbe0405b15306882 SHA-1: 083c5127ef2236615d609267f2718095e6af9a47 SHA-256: 196962ec2a8ee070a4c77ad1869e8095c2bd5e9905738d79f39175f2d3c4c865
204 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to deliver a malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack vector appears to be luring the user to download a secondary PDF from a compromised upload directory.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://machulski.com/public/file/61076725897.pdf In PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/4535696650.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/givitepupezujuvuzapagu.pdfIn PDF document text
    • https://theurbanthinktank.com/files/kirizenejugezutowurekamuf.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26e31bd068---3589338714.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/23235018244.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/kakutesamoxukolapo.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/pixuranozuvi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c556dd3bd78---given.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/f260op8rcjpqg1gq7o9gvbe7j7/wisarabarolalumip.pdfIn PDF document text
    • https://siroyensao.com/upload/files/34786658268.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a12868435a9d917b16abdaf08db3ee60/meziduv.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/28791824718.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/1d6d9c0f313adf7cb9732ed7d4f9a5cc/xujebajurajidisow.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0ec015ec1069ec6143d82a1320408290/36541570823.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/42169227237.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/vabafofa.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/mililetojivete.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/genutamogej.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1bf22c55---bugavo.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/75257369958.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4b709cb9a---dofafekopor.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210621115116152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pengertian+pendidikan+agama+islam+menurut+bahasa+dan+istilah+pdfPDF 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://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
stream_006_off000174e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x174E2 22420 bytes
SHA-256: ffc4670218f77d417f207ff972348470f4c5066c10175fa1b5e5eed92b8d037d
font_00_sfnt_off000117a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A1 16972 bytes
SHA-256: e26f83dd7e4690cad384dcc9c67e346e30c0930ab920ba082cc9683908088e4b
font_01_sfnt_off0001435e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435E 11160 bytes
SHA-256: 60e50c6db723b612e1273c13f2c10e9558897c8546c1fa5f26a38fb18887bd49
font_02_sfnt_off00015cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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