Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7019c8dd6d124db…

MALICIOUS

PDF

94.8 KB Created: 2021-07-27 17:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6dd2a63779f8cfa0fb2d2a47177ff3e1 SHA-1: 1586e0bc74b32ab50b102f2aab89980cff9f3c86 SHA-256: e7019c8dd6d124dba087ab4d2351ce07deba55e18b0959ffba12cc2db682d5ce
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to host malicious files, specifically pointing to compromised WordPress upload directories. The presence of a 'download button' lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the structure and URLs indicate a malicious intent to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b64080bc---81745043761.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3b99a8c4---93047698770.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/31751314575.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210617_E3BF45920C011C61.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/18479322733.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/52543261679.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983a1b94f8c---luzuwevugajumebekuwoj.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adfc0b3d9ad---lejotapa.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc6d828d4---79585894227.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/widifujitomowolepefeveri.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9431c6f272e33f8b824d7bcf3a6dd425/dawozusapiwenedujopasowux.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/gqheuedelm49pne7o5cl0m0fv3/wujurew.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d503c344e---46818078613.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/7544e07a275ce252a18716ee41a435b0/mewudevopizida.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5c3bc58621ea4d5e03f880a4b1707b27/rilafepevejerakegik.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///lisidukesiluvexigomuz.pdfIn PDF document text
    • https://bauarch.bg/files/xipakejaxabex.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/65158476453.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f11b68e0766e39365d27b1b5246e0a5c/gakidelogu.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/defogeleti.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d281ea3faf---90987335296.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/426c5958bcd0787f1f7852301047e88d/84206744404.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/cf5a2b87220f1ab8fb9cf8ec1274b1b0/tasereb.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827c10a8a8f---62065328878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=managerial+accounting+garrison+13th+edition+solutions+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 16084 bytes
SHA-256: 629677e45faedee601e08dfe5d93bed8cb2cbab2933fb40e48fc5543807047de
font_01_sfnt_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 18072 bytes
SHA-256: 5d83a6bf010d6e1bd1b553a398d434bee1ae94fc6bb8fd50c2737306da7636a4
font_02_sfnt_off000138eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EB 11156 bytes
SHA-256: ddf3749bde54068b0f758d6a383fb326be0a8d75391c66f840b634c6b8dcaa3f
font_03_sfnt_off000152e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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