Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ece0c555161d1b…

MALICIOUS

PDF

76.0 KB Created: 2021-07-10 05:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 32b602f0fa7a9790522ccc44c75c8621 SHA-1: 11eead1329281dfde860a3ff1608d1c96703bd3e SHA-256: 23ece0c555161d1b1db8a02a56eef23c18f33bb3bbb9ed7115b5c4338295c8bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL findings are sufficient to infer a malicious link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=colours+tv+serial+song+download PDF link annotation
    • https://grandhotelbulgaria.com/userfiles/file/xozoza.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/33505195848.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/16413255314.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0ea612d66b890bd21d021278f0a90538/99780697696.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096979c8035b---68677245270.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c8e9a29f2---73604365388.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/xedegiroj.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/rezotezub.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9f828d8e---bezuzov.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2880b2af6b---5498896308.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/rukibetawirive.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3lhd6995q48m9tlat9d322ehd4/xafegafepe.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b99494560---89744863240.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/aak4hjhs0nklp315p6rj868hbg/bovekosotojal.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/24937290378.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/53174992096.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0477ce6550---derawobomoz.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/tadidiwulixidinumatutes.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/o7hsui6evaahdav8uvta0u8cjq/13580215902.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/sileverunewodu.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160800c8541374---94096727843.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2c562813---98591968978.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/80448953487.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/5d683bfc39be54b7457afd3df52ebae6/53369394055.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/werefibokikatasumopuda.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a63556a2de6---vatakajawuzevawadijilo.pdfIn PDF document text
    • 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_off0000c4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 16704 bytes
SHA-256: 77c0ca25bdf210b81c27a4eced7a6a59e05116262d97c447e3c624b793ad2766
font_02_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 10704 bytes
SHA-256: 210894129c057e02eaf4a048b5d98db3b3b568a24cf5ce3f95f8d42bb0f9b6bb

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