Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88d2c3aa0b691d2…

MALICIOUS

PDF

72.8 KB Created: 2021-10-01 15:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd3a0ba5cb1348c99fd33ccd5a3f60a9 SHA-1: ca5a6413c36225fc58d51c62194a3e8b7ea6fc51 SHA-256: e88d2c3aa0b691d2da4e4a2fa4fd7734f92072d7dedcca39f400c02a829a211f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress installations and disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are likely part of a link farm designed to redirect users to malicious content, potentially a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/dbf30fb92f58e50e55326f0fe168a089/23147848705.pdf In PDF document text
    • http://tion.hu/upload/file/12979620035.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/remewivopokixumamo.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467a761ff63---rekevafudowedurevigojalul.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/vuxid.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/48428642405.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/zuvalema.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/zawotejedugepupasux.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/sugowonidawivok.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/gonogutufolusigunuwekude.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/kuruwolokumebazibavikudo.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/wisapagipilapujubizitex.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/56596891148.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/xitujelaxelos.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/98015102079.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/92008914985.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/bupisivoposem.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16155e41a52108---zazaziligumujexejifeji.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/kqlpucmn73cj9mv754opgrhsov/dakinugaxavesanimukefip.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/86095769430.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/13541227602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=telecharger+video+depuis+youtube+androidPDF 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_off0000b3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F5 11176 bytes
SHA-256: 55d47558fc037f5c1d93fdae155dba5ecc1c22372372cd596123d0fb7a7de6e8
font_01_sfnt_off0000cdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAD 18608 bytes
SHA-256: d449ec485ef405ed4fecc86ca0a9976ebb554d5accdf8cd3f01a5cbc305bfb4b
font_02_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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