Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba37e5accc4dcf94…

MALICIOUS

PDF

102.9 KB Created: 2021-07-19 04:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bfb0b7d87e676b54b1e950b03b0b6c98 SHA-1: 7cba3807f3982e6318d2d07b2a1552ea1f62f6f2 SHA-256: ba37e5accc4dcf94db062e1816a1ccc0b7108e57423fc8350e91576341852836
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute traffic or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://chroscina.com/userfiles/file/57344595739.pdf In PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160741acc73131---lasezokodowenigazifovalum.pdfIn PDF document text
    • http://cichanski.com/Upload/file/54465800365.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f2ee72f63---bevijiviw.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/glu9ajcm2j9pt8lcvppf3me547/mudijukesitaraweluvutez.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7e64152e---90657682953.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/m2kgcts3c5mhf1o75p0bdffrfe/zoxomidovenojorewita.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/86729463485.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f525aa141f---vegazafo.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/zusomuwoke.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/68675166895.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c8c6e8e450e2822ab36763bf0bcb84aa/20556787868.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cca0b1c8161---sikeroz.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/tibos9minvhn17fif4a55avg9s/pazomapuruluj.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b0b4d5ad86a5f8f542971ca97fef9629/71012770014.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a118526a7fa---85060705992.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3dfec967b---83504631513.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/296ovahkcuif7ljc6mgt19vtp7/90583722791.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/genunovibunazonadozepula.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06ba8cc2a---7361849719.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a9638daea---18236874235.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/nanexujivevut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+bell+tolls+for+thee+poemPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 17332 bytes
SHA-256: 10fdcd0d79ae4fc9456fa545857cf996c91ff96b5778d207a39fea5c9a366d79
font_01_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 24268 bytes
SHA-256: d0b656800583d91077ad82ae255f8a35e50e698acabb91161f4ce8faf7c03fcf
font_02_sfnt_off00015e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E94 10368 bytes
SHA-256: 7a321a7d2567e66d3abd7b277722a96802beff34166212ad9d81903fab628b4d
font_03_sfnt_off000175d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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