Malicious PDF — malware analysis report

Static analysis result for SHA-256 0482dc5ada224cc1…

MALICIOUS

PDF

87.7 KB Created: 2021-08-04 23:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 392d5308f8bbba02e5f96e60385950ed SHA-1: 5859c89c69995721be830682579856071bdba5c4 SHA-256: 0482dc5ada224cc18536529b38484ba998cd6f86ac8cf8181fac01e04eb4aba6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a likely attempt to manipulate search engine rankings or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f721c503ec2ace2524d6ae89bc283c30/merukototo.pdf In PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e5164c666ac---29802964807.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/xazifelitasinogasaz.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/gaputijofoxalu.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/sepumafa.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/udssmci02mtma4gsdpkdoh343l/gatutezojekasafon.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/bdce67a2a9e678ac548becf24529c880/monuvolepomidufulamiwom.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/23403012417.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/89859260458.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/3o185doqalkepklelc8hi13s0l/fujakipatupunegu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbdc9ba5f0---42694549521.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e96893fc4---54026386453.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/58e17f6b2b0c47fdf0e510a8838e45d6/74489294069.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/3l9j2sj4bv725vu26ffnakdtpb/5806827262.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/72069968792.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/fb516540c363ad5a3d1bcf31c1e1d2cd/82462086989.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/s0cqfv65amslv91aiaemqenj2a/44770952307.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/45225dc028f17045148a937783fc1208/vovivemugeruwavo.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/tududamutibolus.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r9i6e0u2ukeqa0rl9p22nv2bpi/77813003946.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/16587053298.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b445af3f2---2588101102.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/53893981494.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/jezusijukokoxezisup.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/48966682113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=5+oraciones+en+pasado+progresivo+con+whilePDF 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_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 18088 bytes
SHA-256: 11a51e251d2e0525ea5f92356b544bf330c1707415e816b9b8c9ceab6143c830
font_01_sfnt_off00011dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13612 10884 bytes
SHA-256: 3c86411979128b76600febce4ae75f1d9ce2964e21ff55dc9f2d2d472512e0d3

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