Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e847a1b1cf0110a…

MALICIOUS

PDF

82.2 KB Created: 2021-07-14 09:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c079fd830fd12093611bc74e467919bd SHA-1: afc695799ad502d6c4301631af6bd670ac4a0a1e SHA-256: 7e847a1b1cf0110a0f3109aa2ebe1f87832b63c21680fb291a1f8b5e54fab56e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lead users to malicious content or phishing pages. The presence of embedded URLs and the overall structure suggest an attempt to leverage these links for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=draw+a+picture+of+summer+season PDF link annotation
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ovvsuk0p2i8vkek0c5bg4ai8a8/voratopepulogogoronivela.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/59049438003.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/57359484263.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da3a48ba7a---rukowebomesunigamigifi.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160850920db8ad---87474442123.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607c577ced522---movidimila.pdfIn PDF document text
    • https://mfdesign.hu/files/file/zapozilunov.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a67819b6707---sefemubowotaxubagolu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a5669669e4dc747b7c8b329899b02b59/36172839055.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1f2d85c9fada6fb7fa6aeb2dddd12549/14942212146.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160818233b080f---22809885333.pdfIn PDF document text
    • http://erdbau-rauch.at/98610261810.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609735198832a---soxejowosuzogu.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/13107418249.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/gulexibofudozisara.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/51137813853.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/6e531234b4f71514ccdad11c3e88648e/pifibupev.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/fonaronafira.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/letiwajakuga.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160921737c29ce---27319885686.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb466b4365---12271303653.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeb911ef3e---patadekujuviworazovax.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d883520d47---gidujujemejinujuranifeke.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/1b5f0bf6c5b318c91101e3b66f573713/wunab.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_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 10780 bytes
SHA-256: 8c11616a4f413385c2829557736bc4f5db6e91bda09ca02fd03cabe361752249
font_01_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 17580 bytes
SHA-256: 6cd500b8a806a4e60014900062c896ca7f91cdf8c729deb66e7c1442aa93de00
font_02_sfnt_off00012385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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