Malicious PDF — malware analysis report

Static analysis result for SHA-256 499eadf8ca98d0c9…

MALICIOUS

PDF

79.0 KB Created: 2021-06-30 09:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 53add558669de739e0baf57a30a0a067 SHA-1: aad5924e66ef070460d3668d4923caedae760d71 SHA-256: 499eadf8ca98d0c9b35f7a5bc4a73490cf61981641c28c7700464a97c92d207b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://medvor.ru/uplcv?utm_term=canmore+hotel+hostel PDF link annotation
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e35fe61f304b688b50722e4c624561c9/rufunegijoxorilab.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/rorinuninugikewidutaj.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/293fabb8b296c77e49099928d0d52ef4/70100105013.pdfIn PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/satez.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/ratukejarajelepenow.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/54928650758.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb75ae8a52---xavoradirorijepoxi.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/49290867743.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/29193014678.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/serew.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d6e0a9be6---82075504003.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9a53e4a2e---99595595870.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wujedagoda.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9bf3e4137---fexajowatirow.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e2b8bde89c1ee599f01bc1bf987f74a6/23821175369.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cffb724277d---36267793848.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160cd506867148---31921121967.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607752b719ee1---buzodejivoxipal.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/557a78f4c9d22fff39c183b71059cf67/98130925696.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/38836750088.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/nazuzatimivefe.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/serulomij.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160863804d5c35---takulosodulo.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a5e0736c58c3873fa1f581d3f24946f6/nimuwegipedefi.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/bovoxuduxabaniwepoxama.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_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 16456 bytes
SHA-256: b4051d66db201d474944975e53bf4f305d3f99946ce5f5cb18af68bc28e08d23
font_02_sfnt_off00011788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11788 10312 bytes
SHA-256: 63e9bc351b05bb1bd17ee2574db80cc71b0b12848f02afd26bf0e8d6b1092069

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