Malicious PDF — malware analysis report

Static analysis result for SHA-256 6484e6c279715ad4…

MALICIOUS

PDF

87.4 KB Created: 2021-08-27 14:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 937abd3e42afe1d01bddd8b80554e8d5 SHA-1: d05a7c31c5de06371de4e7bf68648a80b8974b26 SHA-256: 6484e6c279715ad463bf6564ed36e09333f23ccb320624467977ffa2d2e919ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm with numerous URLs, many hosted on compromised CMS upload storage or disposable domains, suggesting an effort to obscure the final malicious destination. The presence of multiple external URIs and link farm heuristics strongly points towards an attack pattern designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://barudan.hk/UploadFile/file/20210612104240133.pdf In PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/45684814016.pdfIn PDF document text
    • https://digireg.pl/upload/1189370593.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f064ced705394ce3225aec49a479dc64/gebolevotovilumiwokuni.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/50a8a750659f300b2cbe081cc1405dd8/25959174859.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/liminiz.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/g7oqp1v9qir598dqpncq2lms5e/safezodudakomaxidedixi.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/74635575657.pdfIn PDF document text
    • https://activepymes.com/pub/file/pepubuf.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4591f07d2---51811658943.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/garuforerujug.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/jokatipexubopede.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/dawavexapomaxifusazowezo.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/pokagapaladesomusefawolo.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/vabemeze.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/cf2f9c83c967abd2adcf8789cf58a0c0/wozuderejutilapureti.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607919a04df9a---mulavisiralarodemu.pdfIn PDF document text
    • http://tavio.su/files/file/winoleb.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/396f4cf5b5ff76a1877e14e886dd0904/75012545004.pdfIn PDF document text
    • http://npas.ru/pic/file/2209017144.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/sorasomasonotomiwuviwa.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/mepurilimewilotezof.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723927755b2---viwimoterofejigebupaloxiv.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9520f09a0b---16613820789.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/vifebumanodemavekusaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=latest+tamil+dubbed+hollywood+movies+listPDF 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_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 10772 bytes
SHA-256: f9e2bcd09ae5f7181b7be77899987c13f01d760f14bc361a4b19d7359527619d
font_02_sfnt_off000122d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D3 17320 bytes
SHA-256: 22b9bfed42c7b050defd3210162be3f849e87a6bee8bb12379cefbf6cab32cda

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