Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1d055e43a4d40a…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 00:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ddd79dc47b207a2e15b2e16de575cca0 SHA-1: 79ebea54078d78c9266e35e75a66e004c899dfb4 SHA-256: 4a1d055e43a4d40a21bf78a04e277f638962bcfa9a858e778554370d0cf30a10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a tactic to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1a5d55dc2---sitobusogopuxokatim.pdf In PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021061800343880554.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070375c7f460---xolewixugabuselowima.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/lasagened.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/dg2odju2kpqtiqfr9vdh78dhsq/perekesigesosororikimik.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/72765841506.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/mofabizad.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/fugasuzewadelo.pdfIn PDF document text
    • https://koratspring.com/upload/file/78367397442.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/88326820809.pdfIn PDF document text
    • http://artside.org/data/temp/file/nokugavajokumewali.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/54414558964.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608699a6003c2---palexaveninonaguxa.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/wifamanojif.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/2371904368.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e7d829d2---32403373989.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/wujiloxasiruwuf.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/rakedibefel.pdfIn PDF document text
    • http://vititanon.com/user_img/files/69881641501.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34041222362.pdfIn PDF document text
    • https://ancoraeducacion.com/images/10514051737.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/famobezatorugatif.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/duzalibufadorakuwadap.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/8503052999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=wow+classic+tailoring+trainersPDF 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_off0000c70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70F 10484 bytes
SHA-256: f6aedbf4eb0968af858366a8746b27e96366af3548968d3da5cc0285bbd561a3
font_01_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 17504 bytes
SHA-256: 5d3abd3bf36b9447505ca600da137650f4ec83bd79240597011bfe9521d0073a
font_02_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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