Malicious PDF — malware analysis report

Static analysis result for SHA-256 473043ba237f0af1…

MALICIOUS

PDF

74.3 KB Created: 2021-10-01 19:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 595ac9750506d1b9761c0740968d4623 SHA-1: cedc16eeabac1c76bc388bd1772aef44ac6d9b28 SHA-256: 473043ba237f0af1d4659111db424112098ba72b7b13024f59a4cd35ec76235a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators strongly points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://synerhu.ru/uplcv?utm_term=no+more+hotspot+on+my+iphone PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363178370ba---45921283337.pdfIn PDF document text
    • http://okvin.org/userfiles/file/14039318156.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/kunub.pdfIn PDF document text
    • http://contelex.it/userfiles/files/pukejopafofovibigi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16147cc632960e---komulina.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139cee1919eb---varufupiso.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109250556488874.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/15716793921.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/551087889.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-19/20210919215916868575.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/juwodenemipobatexezut.pdfIn PDF document text
    • http://195exim.com/datas/files/66399405519.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/39883804589.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jolakazejinegalof.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/84039467563.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/22757316279.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614f87c21f9d2---redogipulikidojalikapapo.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/52317613769.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/2104438591.pdfIn PDF document text
    • https://luminex.pl/upload/file/19455439939.pdfIn PDF document text
    • http://yuha.be/_files/file/6002573897.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f4fa91619ab7080397f4fa55e2aaf3fc/44729559496.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/nerarawavorororemo.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/9btug80ufocqpjav1ascrd5m53/77785892797.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/46525715752.pdfIn PDF document text
    • 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_off0000be21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE21 10400 bytes
SHA-256: 1729245b07f8b0ca5f1c7d7ea3af42fc6e81bdd0200815aa657bb0ac143c5841
font_01_sfnt_off0000d580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 17768 bytes
SHA-256: 6ac3ecaff7417732d69fc4e7596861eb085c1dd31cb6b051198fff662489ba9b

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