Malicious PDF — malware analysis report

Static analysis result for SHA-256 315ff7a5aae2edf0…

MALICIOUS

PDF

113.2 KB Created: 2021-07-19 03:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ba4da96fd60ba04c37968b08758cf6b5 SHA-1: 742dfc02b0ee45e0fe4c721deabf31b56a5e865d SHA-256: 315ff7a5aae2edf05058dc13db3b9ed1e905f5e1eb497524de1b74f2720d0602
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous embedded URLs suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b310ca90b91---malimexosenupilo.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36968849e6---nejetotegatanufidixew.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a4003e1f8---74168874943.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/38213209874.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/3711275353.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ce1ab8b35---lemuvis.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/75999172280.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/10634517093.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/71354542506.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160720deca6c94---38494103239.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/jometijijozexafolon.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e325a39ddc1---11256564280.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ff64801f99683d36f60e5261a1b345ec/33338297567.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/ludisoxologadofelibo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f313ca4c867---mozukes.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089c32a4f442---13342170946.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/tumowilin.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/27530132459.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9fb2e19d8---10410538308.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/kexuwelibipov.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/cb10c91d4c4599a9112937527436adbe/10783956993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sexual+and+asexual+plantsPDF 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_off00015a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A71 10348 bytes
SHA-256: 21baedcaec76b95507cc4de30ab2e334b83f540e4582bebbfe90b1b7d4bd2557
font_01_sfnt_off000171f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F2 17732 bytes
SHA-256: 2a4102bb54a805ddc3b6d9b6050d49271970b15c2c7b83fb275c5ef456900b7a
font_02_sfnt_off00019fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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