Malicious PDF — malware analysis report

Static analysis result for SHA-256 205628751fc0f7e6…

MALICIOUS

PDF

95.4 KB Created: 2021-07-25 12:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7d4774c7d6da26a9845aa0ad044f6088 SHA-1: f8db89b3d8eef55b508cc77af137bb50399291cd SHA-256: 205628751fc0f7e60c5e86097e7911efb15200db09bbedfdce99e2a9fa2c1283
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, such as http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/0178efdb43054dd12f35dbf8674874f6/selewa.pdf, are likely part of this distribution scheme.

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3486b34fa8---39692333136.pdf In PDF document text
    • http://www.abcklima.hu//data/editorfile/mizamaxewesuwoziwiril.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/2fd513ed56b58286b9b214e1a01f1713/35362635202.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/6655482284.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/qh4gvc4epaeeb1nt8m85jgda9b/20243079383.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/h8nkb8e47oetpp9brrbb27fde5/musilitifanaf.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/0178efdb43054dd12f35dbf8674874f6/selewa.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/44702902330.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f8d274bf---93169631629.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/5f8a1981c1ddac95caac408e0b675b00/kowutejaz.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/20043093556.pdfIn PDF document text
    • https://irrisyst.eu/files/file/85317983838.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/36377501928.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/5f46e3d6bc9211514ba94db3a300aa22/fokoxaxikovuposudakinabe.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/2b06a161d2cbf47fd23da19d4322514b/6589311842.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/bivafigumosonub.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c00683e7---30119770621.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0230caf67---zedanuliwofeposikoxabexu.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/22244076062.pdfIn PDF document text
    • http://imi.vc/upload/files/rasatokufatesinogepemeju.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8400bd950---kumir.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e632ed9ed8---80572685955.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/4f0b53b9eea126b03fd04da2816e0980/43202613567.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/52143776763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+are+the+major+causes+of+conflict+in+adolescencePDF 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_off00010de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE4 17192 bytes
SHA-256: 68c1af762337dac7d13e6e3bc443ecabdf0191a6646b0cf7c490897bee489396
font_01_sfnt_off00013af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF8 10964 bytes
SHA-256: 4ce371fa4c0e995728f4c692db57360b57182812709c0bcf31232d25f56704ff
font_02_sfnt_off00015439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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