Malicious PDF — malware analysis report

Static analysis result for SHA-256 935a2f53cf44ca46…

MALICIOUS

PDF

84.5 KB Created: 2021-06-28 05:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 1c75701e1be560f0a41d654a397e1ec9 SHA-1: d10216d77264af6995f77af7cd21447484e5c1c2 SHA-256: 935a2f53cf44ca46e1d9f9b32f89de5b195c1bb64bdc9eba4af4801a19bdd81f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous links point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=coralife+digital+power+center+timer+instructions PDF link annotation
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4012cc1395---kokuzarafonaxaridemerud.pdfIn PDF document text
    • https://medtek.vn/storage/file/82841982664.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aca9de4900---sewuda.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/letizurasobul.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/29163758126.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/fofukedegedize.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071938e526b7---xenepinazagores.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084352f12e4c---xanedobinisesabukir.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/gajudomu.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/movoregidemeruvunenepije.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084345ad6213---tijibobixiwipidatemuvema.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879f12a1707---junofisazopuzepabofubozi.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/fozanelo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e93d6de928---kuxofekufelekufewefe.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/13rhg2m8dpehdbuvjrm1pib564/23443708254.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/52014892533.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/93026669959.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/ruxojijiwek.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d137211fd9a01aedcb76dc7de64ddecc/wowutefukirazelakok.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/vipexojam.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b33a0dda36b---zoxinisoweviguteto.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/sojadesevakalavululewe.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/928bu04glvknd4hmeidun6rkug/murapebusinu.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/91814158910.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/xokaj.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_off0000e6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 11180 bytes
SHA-256: a9e5ab9949c3bfcfa1daf6ff6eb50dc07c02f09aa351dc3130b160a292c7ac30
font_01_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 16632 bytes
SHA-256: d636ed859e2226974f42c5685dcfee6cedb1b0ecc53b10a9f0d3eaa1066bbf3f

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