Malicious PDF — malware analysis report

Static analysis result for SHA-256 f577dde90d907aa4…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 06:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c37475be9ca5169d3b8808c29e04109 SHA-1: 46932a852e85e08de6a58f1932df784cb7aa7114 SHA-256: f577dde90d907aa4956c52beb845ba013b6fc256685a6a506a324899d31a053d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=pencil+sketch+techniques+pdf PDF link annotation
    • http://anthonyvienna.com/sites/default/files/file/4473952201.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075a36bf1a05---puxuvopakakumofe.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/wibuxivefilobone.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/83520497837.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/18980622584.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/neruvawudakajit.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/23975618958.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c173168a10a66ca323c246232d9736b7/fidituxibejoguziket.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/92835564466.pdfIn PDF document text
    • http://cy2hand.com/userfiles/37289472048.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45422615395.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608992cbf3d44---3288821783.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/aleune23h0np58m4k9ch0174v0/nuvomisojumazazesado.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/d973c7a1bd1261a9c41f4cc2bec69b0f/vunesibijelotefa.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11d9202b27---99963249812.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/nijirozowafivaxolaziga.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/18415899480.pdfIn PDF document text
    • http://medica-brno.com/files/41546983523.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/rolamiwujuwolapi.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/vezuxovuzifewabu.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/mapekavawo.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/gifapugepujidewoxat.pdfIn PDF document text
    • http://www.moyekolodin.com/files/42434337355.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/tugorejejaxulap.pdfIn PDF document text
    • http://jogamiskolc.hu/ckfinder/userfiles/files/gubewomunege.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/91634169015.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_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 17132 bytes
SHA-256: 6941f56abe9988c95631a11acfb217c9003f1d86d404308f6f390ddd79d1bade
font_01_sfnt_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F8 10672 bytes
SHA-256: 78e690c1eec642c33e6d012e14adc2b56385671639048b076a88d9887b2f7451

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