Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bb21573f9cb44a…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 02:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ddad2cf958058c18268c0654e3233a2 SHA-1: b52204bc48d2bae01e428bec3cbb70625779ebd5 SHA-256: d7bb21573f9cb44a67ae42949f333db31f1d6408b9eff36875c240052aa0a540
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the links and the detection names indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://automsystem.com/UploadFile/file/20210717095634491.pdf In PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161237f721183b---takagasune.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/13799758988.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/e7g8sjgaeul402mishhat7vjaf/mijegiduridop.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/xivifaleboz.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69f79bd6e---kotalozafaletowebojo.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5f82e9cdba7415a60fb34074695b87a6/76972155778.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8993bee8df22246317324dd56f19b81a/76530117791.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/31227077239.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0a32rhhbp12o08ukbq9mr5sk21/44429812746.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc1548c877---vuwixipelafiropavo.pdfIn PDF document text
    • https://cristalensi.com/public/File/34619037800.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/lodidis.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6bca66d9e---zadavikowabunepuw.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6e506a28aef34b200824afe49800762e/safumiviwuj.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/37258788285.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/61615005170.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/xojorilududuxaxejogoxuzoj.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/bibrn7rd9qurp8m81mm4o8ci61/18568314486.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/54900035426.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gofamufunebuzetametuvofub.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/nuladu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=important+of+communication+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://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_off0000d689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD689 10484 bytes
SHA-256: ca35cfcb378ccee3e2b437d42636ec5760432272521ddee68e47c5a9abf2533b
font_01_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 16236 bytes
SHA-256: 80e3e588944029ac4bd0ee635ff91b586608bf3aef435ed327701894b99b318e
font_02_sfnt_off000117de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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