Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdd21498e777ae7…

MALICIOUS

PDF

84.7 KB Created: 2021-08-28 01:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1f43669a9cd0084e5c2bb1e1be9a0089 SHA-1: edd3be1a1df48e332226bcd8daa1abbafbcc4f7b SHA-256: 4fdd21498e777ae7c0326849da8cf6d08b938ab37d34a7a3cf13302dc67f600d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • 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://bepxuyenviet.com/upload/files/73539996675.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f7c464e73cc---28924085909.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/23747692101.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/11338192758.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/7892529776.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/zuvisaromusuzu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070242e0402b---solukuzesisuzaviloko.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/93008107283.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/pak3cih3iti3odirgqo3qhjtn6/gotiwo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06ed683ed7---nitotoniteneroxinurixezu.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/vewijojudivibatano.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/95497018966.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/lovitikupuxurafajuz.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0e47c0b2---rorebamodimulufonibutax.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/25081230866.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/veweje.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/zosejorinozudaninirez.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/3f16cef2df3a2ee4bb6e968a2c97193b/98445978794.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1628382925wefixekemitupuji.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/kubuf.pdfIn PDF document text
    • https://medtek.vn/storage/file/tajir.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/7289617357.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d5cbd4c2f0eb01caa8e7695ae4fcd5ca/31268816278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=first+human+to+walk+on+the+moonPDF 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_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 17696 bytes
SHA-256: 34dbb8e90c9d0929d129f0c2c9522e7243e3527d593658c33a0de2fb57d39d8e
font_02_sfnt_off00012c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C22 10628 bytes
SHA-256: 426f2e0f83eed8267367152fcc38236090c194c689fec986d25291c1fd2782c1

Open this report in the interactive analyzer, or submit your own file for analysis.