Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5b3a5d64c40a9a…

MALICIOUS

PDF

97.5 KB Created: 2021-08-03 02:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0529210bfd608661fd25969ba7da63e9 SHA-1: 52d6460158c7ce3311e740e6136909f953b92e76 SHA-256: 3d5b3a5d64c40a9a687660903da50eca36c63eef862b0cb8a0066892f967e690
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous external URIs pointing to compromised WordPress upload storage and disposable hosting. The document body was unreadable, but the presence of many URLs suggests a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://inwebjor.ru/uplcv?utm_term=how+to+farm+accessories+bleach+brave+souls PDF link annotation
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b18833c7b---lozalidunukakuduni.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096fdd385166---42204500311.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xedazexaj.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8cb163d21---26551717624.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075556f11d0e---830709205.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vh6dp5fq57natdt64djhegfsis/67799688239.pdfIn PDF document text
    • https://majubesar.info/contents//files/39006222509.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83102b12a---jopasijesez.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078911db6298---rujibujum.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/waxodupufuzonokuk.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/vufujelulejarepugogov.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/tr84bn3oq6teh3pdsuqc656t4o/vofoxuxurumovuto.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/mexipuvanikozeguzulu.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/fcda024396d72cb1590bf900e0d2039e/begizorenetawafenoranili.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/e47b83fd5b8991f1001f2f0a8019b053/vixamegate.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/v8n6hukvn5954ioqjckmvte7em/tijejanivub.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/suvifekusejexemizafedowot.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/bufodasefitinewido.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160faa798f1285---mogafititifizavatar.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210702_193649.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/nonavipiralavokolemababov.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d68120cd327---67017552953.pdfIn PDF document text
    • http://furniture83.com/upload/files/rinokibizexosexepuk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 16956 bytes
SHA-256: 0fb92edec0f4b0feaaab73329248fd874a9394eba418571086c9f87d5b944965
font_01_sfnt_off0001177f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177F 17904 bytes
SHA-256: 754a04c19bbdcbc8b0b95b3a970add527c7fa509de9cd5ff85d237dfb7cfa962
font_02_sfnt_off000145a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A7 10880 bytes
SHA-256: 4f86dafbe3d8fcb1b437bcc816750135b24915056da0fc31eafd2a6dbf7efe36
font_03_sfnt_off00015ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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