Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2225ec93a0b26ba…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 11:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 47b190ea8b1996284c6251cf3c1fb117 SHA-1: ee7318f760cbb3cda1454f5d4d5c70b7d028d2e1 SHA-256: b2225ec93a0b26baf9483cb2e1945a1fcfb74102fe3ada2d8271f888f4cca80f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tznjl.com/userfiles/files/61787516179.pdf In PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/zegamubogarapi.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/87579808608.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/nemasefenexenepor.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///85718565961.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/13746292306.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85db5b99f3---xupipedijaximamumoj.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/57563264037.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/gebivus.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/71256711267.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cf52ba8f263---9235332638.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f0328a4f459078c04a560df2ee348603/72393746662.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ub0bda377s9l44f9h6c01cuspl/disabizevaribatenez.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/64119016987.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161330eae22ebc---80674310827.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/pigiporakeg.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f0da964e533---bujakewupoxut.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/nunumafomabidunide.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081b208408eb---vanaxitofujisege.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xisalofibiwisonepuge.pdfIn PDF document text
    • https://wsbtitan.com/images/file/53396871953.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/32194119228.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/wofemarotuwunax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dawlance+ac+remote+manual+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/muwetisemopopamosedumu.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_off0000bc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD473 19428 bytes
SHA-256: 2b7d5a422bef5c6d6203e4faf625b19ec3b874199639e205297cef5af484d052
font_02_sfnt_off0001077a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077A 10708 bytes
SHA-256: 7b95365df4df9041d0a9970b4efad1aeb22a9d1c32de5f04074fa2fb2425fe0d