Malicious PDF — malware analysis report

Static analysis result for SHA-256 039e9ef10fd40176…

MALICIOUS

PDF

90.5 KB Created: 2021-09-11 01:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e4b58f4ce6aec98ffc2999bab9843fd SHA-1: 107a6e669b1699e3de190d2ec4cedf6589613e82 SHA-256: 039e9ef10fd40176450ab65675a81afae952ee0bfd2ea3c754026c4c17db0b2a
196 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_SECURITY_BYPASS' heuristic and the presence of numerous external URLs. The ML classifier strongly suggests malicious intent. The document body is heavily obfuscated, but the heuristics point to a link farm designed to redirect users to potentially compromised websites, likely to deliver a second-stage payload or conduct further phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://smidgel.ru/uplcv?utm_term=crack+status+assassin%27s+creed+odyssey PDF link annotation
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337044ecd22---vukadinojamiwuzix.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/monokikerizekananepusoru.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/60220005663.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/33260827866.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/tulamugob.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/tisegukimilavesefinamuj.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/xowawodezubemo.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/22422701699.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/mozilapavuged.pdfIn PDF document text
    • http://fxmeat.com/upload/file/270f357fdb4c17ace6394ba3e744bed4.pdfIn PDF document text
    • http://artio.pl/files/files/noneg.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/22294916952.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/90917243548.pdfIn PDF document text
    • https://coil.hk/upload/files/81094410962.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/26338172253.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad9407906---12985385099.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/buwezi.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/moroderaganuxivujagedir.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210902121727.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/donuxijisigedebikuzugeno.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/83899774796.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/soguneloxuja.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16133d21e72538---33010027607.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/pinegijuvarovopu.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210902155636.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_off0000f8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 19248 bytes
SHA-256: 86d8ce2d46ab95f4889bfdaf89a8aab4c68f25dfd4efd1bb80f5414f3f41de39
font_01_sfnt_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 10688 bytes
SHA-256: 4c5a114ce593f08720dd6bb972d983e86a9f53af1a316a55919c18f99b9af009
font_02_sfnt_off000143d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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