Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a4ba5235a36903…

MALICIOUS

PDF

94.2 KB Created: 2021-07-05 14:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 1e7ad8dafd21b3cf273abc1f5bf724ab SHA-1: 1505116b46349eda736888a26472c50420ee14a8 SHA-256: 28a4ba5235a369036732f0b71f24144f34aa7b2f10d3e3596c9bb030431f3826
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting a large number of potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://nabsangram.com/userfiles/file/72942769859.pdf In PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/bivebekimejadabux.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sikatera.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/46732904707.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0875391c---fumuposevanowidug.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3r1mn6d96fjh71c97nofhut4kj/93808008331.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754c9e1745d---gibufiboje.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085db893aaa6---6933283349.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16082c45610606---zudejesagisonerig.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/nesunugesokatepokobak.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/23839391641.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/fozaborafizufapepolugi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dedca03cbc---mawufake.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/folodixufajorijofasajokev.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/d88beab3ef75886056c090f7a09923ec/42971828950.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/22764207348.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/m4u5tqlj5s44nt0a2p3ra5b30v/fusipodoxa.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/63539381181.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed7341ca34---jisasanu.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/malapadizuzepixebejiro.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f9e45583b---63329538474.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/26451528427.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/9581073c44ed7f62e355d748970449f9/11035903618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=rocky+mountain+national+park+pricePDF 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_off00010cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001250a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250A 10716 bytes
SHA-256: 8fdb85cfdd0ba018d2d0ac5f191e19c330fbc2967f4490249b1ddf8ec10c34c3
font_02_sfnt_off00013daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAA 17484 bytes
SHA-256: c1a7c4619dacb2e87d6bea41a80597e9664d64b60999dde2ff4fc9319c296991