Malicious PDF — malware analysis report

Static analysis result for SHA-256 32da3646c996ecea…

MALICIOUS

PDF

72.5 KB Created: 2021-09-02 00:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 41198158b9acd1a4fd645f9012c51f1b SHA-1: 0899d48adb95f87db360236a780eabe10151dc7e SHA-256: 32da3646c996ecea7c67cb21798221dc7057116d37bb08349a47c371ea7b9efa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities in PDF readers. Heuristics indicate that the PDF hosts a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.minaakshimajumdar.com/fckimages/file/jogegadazisujigitibesu.pdf In PDF document text
    • http://unibox.lv/files/text/boxufagek.pdfIn PDF document text
    • http://bscartridge.com/pic/82357547936.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b31f73bf848c5df00413ee3786a6c9b2/932327340.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/36944547909.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077061f8c9f2---tipis.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/tukasefufukovo.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/dc0f1bb228cabc69372d0333563f4c27/64637645786.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/68b9b007b678364b4576e1cdacfbd368/lireb.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/lekutubupik.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/cbfe3b05b85c239895514a2fb9033e68/78554978182.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/69565138149.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607224ff1137b---kidokorov.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/53916043886.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ff7e086d18b2d47262bcc9a1a271b14/laxuninesexobetatibu.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/kne7qtqkr8vo7hiomhgcj0s55k/jerokewabezosibuf.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/voxifugodi.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/welamukuxavavonojukuped.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/suxito.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4f3b4d4cc9878172db04a1031bcad746/52482875616.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4ffeb399ab73f84f83be809b6ef0718d/10158566591.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/vajazoletal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=parallel+lines+on+a+graph+equationsPDF 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_off0000b942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB942 16140 bytes
SHA-256: 84a49b08b9982e7db593a199a2c4fa46299dbf0a0419f0139316fa998d649b3b
font_01_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 10776 bytes
SHA-256: c46cb4fe810879fdba85f223aaf28c7c6d85c9054f7604c4dd23b3887a015973
font_02_sfnt_off0000f9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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