Malicious PDF — malware analysis report

Static analysis result for SHA-256 b544008aa21bd04a…

MALICIOUS

PDF

80.4 KB Created: 2021-07-17 00:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c845126cae85ce151c987dfbf877231 SHA-1: 738003e891e556ff28b58c99128fe2364b23057a SHA-256: b544008aa21bd04a2e883eac17622f7237b8563b447b6686051eb4d987d38ee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious. The embedded URLs, while numerous, primarily point to potentially compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608007a268419---jivobuxonatasuziwonet.pdf In PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/20864257313.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/67101822447.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/pawolifej.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/bibomu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d509664a68337c4e40789424e616d170/mizativepawobixipuwenus.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2f2ac3d8f85005b677711d359e591d11/patop.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/zubukuj.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/witozafuzopipofubenevafe.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ad68f15ab4a50f6e1d165a067c15d65/90806895620.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5efd25f8c0d2662783191af815f97a57/48438600218.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b6fabee085cf1656fa4c424853aa9fad/rovamajagexixamopafu.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/vugazubevuwitagedowo.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/b855q0op6jupk6kjhfrvk7l33p/83437291483.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e86c9b0f835---46689895413.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02761ce25---76156532837.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/7023691290.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/vivaxu.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086e15105fa6---3965263644.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b4d7817e9---vagutujalojuzuxemuvurazem.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/debikisibawi.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/kewoxikukodus.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/98270793610.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/vikepanugevujavovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=simple+compound+and+complex+sentences+tablePDF link annotation
    • 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_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 10992 bytes
SHA-256: 51b1d65e502b717b8fa90bf52c25316ed3dabbcc9d1e966ca02bcbae55f193f2
font_01_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 16772 bytes
SHA-256: ce4678dd5cf82245b496a14730c20c8b06c340bc6a0489526d58e811ef40d511
font_02_sfnt_off000128ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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