Malicious PDF — malware analysis report

Static analysis result for SHA-256 152cd0844fb49e5e…

MALICIOUS

PDF

92.4 KB Created: 2021-07-27 23:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 09784ab091bb0811aad7cd12ade5f241 SHA-1: 155e94459179e7b9205ea2fbbc3c2e032ebdb679 SHA-256: 152cd0844fb49e5e43dcd676dda0c26543acd7d6625786e051d5624f7041cc66
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 pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct textual clues, but the link farm structure is a common tactic for such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vettercycles.ch/userfiles/files/lugixetudipaxo.pdf In PDF document text
    • http://fandimnarodaku.cz/upload/file/76887800681.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/57499927526.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dd33abb2---paliraxedun.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/51407146752.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3fb65eccfa34bc6887fb3097102f2afe/52263757861.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/91917951857.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/1505814209.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/besufatadazitejotovedo.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/84d362ecd5b356fc6ca953d89b86525b/dasamumisizidu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/nmo0a1i3gjef5sqa766svp3gp6/wivadunoviwuduwakibigir.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/11687627613.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951a126e1e3---64314520743.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e07fcbf---gufomikuz.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082800338895---gitof.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a614bd08813---35722753736.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/68f66fb8b0af5a81a5938e74f0de3868/lexunibibofujuwozazevad.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/95069826036.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/jetusegupezuzak.pdfIn PDF document text
    • https://norservis.info/files/files/71179499546.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/dimonivegunifonela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=autodesk+quantity+takeoff+2011+free+download+full+versionPDF 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_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 17564 bytes
SHA-256: 8663c658fcd2e57a856dc45c29e8ca614e9086be78d40daa32b9af66147a6a3a
font_01_sfnt_off00012e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E61 11224 bytes
SHA-256: 9e37045187cbd62afe51d7f57f44f6ef3364efb9f2d7e7fcc493e23865f9939e
font_02_sfnt_off000148d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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