Malicious PDF — malware analysis report

Static analysis result for SHA-256 da11896beb1e02c5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 01:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6d862c35bed3f5e5833b296e4e660969 SHA-1: f7f769c56f524c14e6076539c90e0e0e1569724a SHA-256: da11896beb1e02c513af1319d061775cbf6925cbe80a93fa3e90c6cc97e719f3
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 of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://benhvienlaptop.biz/userfiles/file/xaxuxajuzobazivizelupav.pdf In PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/212b087235ab7893b640629782ed81ab/23363666705.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/98783228457.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/gogal.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/nl0leivmbn722u672o62qdoljf/41245030193.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pojilopugezexajaxerewates.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/joxonapavowelutaxi.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/78288068514.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/13142695433.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/lajajadole.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353498677a7---sixajapemarozizige.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613609f422ba4---tivefinotozavexu.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/gewiruwerudepuwijedofulok.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/soruvas.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/taxef.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/tagasekavumajirov.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/30798551994.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4e78fa25---bijoni.pdfIn PDF document text
    • https://topupdana.com/contents/files/58998893140.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/89794a2f49e2dd4c1f5333b64e80aaee/81534241171.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/65111242469.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0971fe62---62701320492.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/58958573344.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/25694558383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=grim+quest+mod+apk+downloadPDF 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_off0000dc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 17320 bytes
SHA-256: 23f7a1cf489ad593212ec6b302d2359fa31843e2b0497b568c8c4c86072a8e1f
font_02_sfnt_off0001215f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215F 11016 bytes
SHA-256: 5bd07a71e246a68222527ffdfec31c3c64ad760366c853bef9b4f4c458f222f4

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