Malicious PDF — malware analysis report

Static analysis result for SHA-256 35358bea62bcbed8…

MALICIOUS

PDF

90.7 KB Created: 2021-06-29 13:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f109c0587888b16a33db780d71f9349c SHA-1: a9896c4db60d8ad0235cd7ddfb458b1822e8fdfb SHA-256: 35358bea62bcbed88a4b4769f2341e147879a72509dcec00fd825c45b2f5842f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=naet+emotional+clearing PDF link annotation
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/4a8c1nljsb62q625t0quf0e502/janugizibunavibedivik.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/5bdfed0df61009a2c9ad33d90b1c9f9d/35236892781.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/11397105581.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/kaniwovilorepu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea8173c6d---46236352291.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/37859714495.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/643b892c9e64c23f4d9e0d4a010a9a1f/xitijoxupato.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vitikumo.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3ecd6cda6---92957677414.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/najesupajunizumow.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/wekuzipom.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071ee32e01c0---zefuvavefimalolaza.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098979d94e96---muzitikosutoluran.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/05bd5bed7c4d71fca2416351f520d485/84883255498.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/60924247962.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/38704850095.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d571bdc9f5---12844995483.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/talazamutijeje.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b084b35f132---vuzede.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e763553d---zusolujowodekinetitad.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/aedd5715e72968417fea6986b5bb4547/49589972358.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/mubotab.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714e57bfd85---metuxisoz.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_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 10384 bytes
SHA-256: e40fa291b50f472683496f2359f67adcb52b35e28ea65db465f498ceb7b3ade6
font_02_sfnt_off00012e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E11 18212 bytes
SHA-256: 53becaaeca5beaafb9b7dd926511d7c947af94cacdaccc3311e4aa580bc53d49

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