Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6f2ac63fefd440…

MALICIOUS

PDF

85.7 KB Created: 2021-07-19 01:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c78b04311a2a295689ad0765ff4d17f SHA-1: 7a6e44f1a88cf4551405f76d61a6495345b1f587 SHA-256: bf6f2ac63fefd44001f490d19aeae0610b5756e8f2370b833334404c320448ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL analysis point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://classicalgardenfountains.com/uplds/file/wazufaritaf.pdf In PDF document text
    • http://oaklandscreche.ie/userfiles/files/zodafufejupiwowuwasisasok.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4tmqh72ek02981068eln9s4n0s/senatojiwaxepov.pdfIn PDF document text
    • https://arerp.kr/data/file///laxijijetu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb89cb2649---menaw.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/gilotelapugokabizasezoru.pdfIn PDF document text
    • https://seikico.net/img-tym/files/15356418250.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3677e81a---33114520577.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/93302941165.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a0ce20c04---fobezevojoxibugo.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2f742c468---vogajup.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/zorebozumuromamos.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/54333351033.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079c3ae34b55---26652770179.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/50373436823.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0tu0r12efe11v56ug3ns3cvjbs/tosuves.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afba0ec61aa---goxodonapowom.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b463a80896104e072e91867e38a9a0e8/80852445555.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084433b2c056---zetetebodidebawevu.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/ee4caccb5f96d38c0fd0da7957f781cf/domenogisutivijul.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/46537769499.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094295bc0d32---savisuzesuzojewuro.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ki9f5f2d70grol5mt4vnvmn960/5912277286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=i+like+you+too+meaningPDF 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_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 10440 bytes
SHA-256: 38afc47f0eac8d5e5d19740cf9bc9808a91d4f88d63a8f25df26b614415e1b42
font_01_sfnt_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 16388 bytes
SHA-256: c4f0727eca1652c49f02fd3cee59e5976319b44e6c1dfeeead24adfd5abc1b42
font_02_sfnt_off000131ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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