Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f52540d3376d1a…

MALICIOUS

PDF

72.4 KB Created: 2021-09-04 01:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b3f8bfde1507a3103d05af87bd5f44e SHA-1: a0ff387adfa20df6ec3ed32eabbbb7bb8f5922fa SHA-256: 78f52540d3376d1aae7ae457d96ebd954ec10e5eacde9937fbd3381e8f7453a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable domains, indicating a link farm designed to distribute malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/s9t1ef2edo1h2reprg3la5757f/18464469966.pdf In PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/2672328249.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/5638125565.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b87d52968f---buremujugobibizuwowufelow.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/50350839585.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd43a6dbc4f---35975433569.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/lewabipa.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/mowozozakedujum.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609dee850c30e---68282386834.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/vonepepoleravefagorivelix.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/9836472939.pdfIn PDF document text
    • http://eichler-kammerer.de/6622138916.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/kocs058vsg3jldimd70h3t8ct7/79208828407.pdfIn PDF document text
    • https://mytopics.it/uploads/file/xofojisugirujumakif.pdfIn PDF document text
    • https://armenia4d.com/contents//files/wepojebadalukotagonu.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d578fcc040---zonabukovonidumadumoxupe.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/39404074102.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cb33654a56025ab8db1923d353bbe4ca/soraxaxo.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/76301159106.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/30522779853.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160f033aa9f2e6---53505289934.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/dotudizuposafajilureru.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/22108775101.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/japixinaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=design+as+art+bruno+munari+pdf+espa%C3%B1olPDF 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_off0000b69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69E 11288 bytes
SHA-256: 2b6ac282ca2b6b428acdc4c0f7ea6d900771991ffd222b3accef4b1fb8f692fb
font_01_sfnt_off0000d077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD077 16184 bytes
SHA-256: d2803fdb0ff874158c90336277365de99143006fffcaaaeb6d563ad35a1e5149
font_02_sfnt_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1