Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5cf21cce41a8eb…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 16:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7201d6565f8af888a5380467435d6a12 SHA-1: acaa0e8835c5ccd27fefa5b2bbabc4e4cc8bc046 SHA-256: dd5cf21cce41a8eb3c4c109cc6709da882b7183f0b67b42ad31e473a43658c1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure malicious destinations. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://wonwon.taipei/photo/file/49801490592.pdf In PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/wekuvawogeb.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/e9u7gqcdt3tppbvf3usctego86/mixaweguditugelutu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/godijel.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/dasoponomobowusenopegata.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/fezafawanazog.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/mixuroguvetofirurovuvigad.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/jijazaboperajidimosezeguw.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/xagajorufazane.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/jejidosufanujofarunisa.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd7f8906f---23497708212.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611123adba09f---88232885888.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609493476a795---78000358563.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/10785780636.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/89680228992.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/27079186892.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4d49538019a298644795d47928f50f54/wegefiz.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/9094207140.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16107da0527792---nitosovibofisuwe.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/xifefisifoz.pdfIn PDF document text
    • https://siroyensao.com/upload/files/rabaxiridaxa.pdfIn PDF document text
    • http://dztechfin.com/upload/file///nanowovesavoziwazezo.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210707_050010.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/debujiwawagomib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=stratocaster+setup+manualPDF 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_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 10616 bytes
SHA-256: 06864fa840cb35839b5ca2041a6e82bee88649e5de9bb9b0ea8b632f816f7c70
font_01_sfnt_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 17904 bytes
SHA-256: f56b548dec208e4e369a3510766edf8163697434efe30d0125e88b563d1b6ab4

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