Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bcfb8b9e084c37…

MALICIOUS

PDF

102.3 KB Created: 2021-06-30 06:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3fe169fb74cc25f76fc88a8135d0780d SHA-1: 5f1a97f12e4a73cef668ccb5e568b0cec4dbc580 SHA-256: 27bcfb8b9e084c37ecf9be9841d8167ac877625cf16c445f1302c21ee2729086
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://krisoc.ru/uplcv?utm_term=aptitude+tamil+meaning PDF link annotation
    • http://bjjiffy.com/upload/vapopuremobituramofexu.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/553961544.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ac83b73446990d1e55794159b4204440/zikewenewosegufe.pdfIn PDF document text
    • http://allycatering.com/userfiles/xaregonakaf.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ac622909---daborukikevajujewin.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/99rscle02bd2005jsrh4viisu3/80341945564.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/vhtd9ob6tig08n682t6hh75cm2/36503474484.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16084af071572a---ledukemewulurugizuru.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae851cda9d---nelesunonupemasaketo.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/54587155831.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2defe61b0---5708029499.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/6712fb60f74056cfcec7d450c0164788/80643057445.pdfIn PDF document text
    • http://brlairport.com/images/file/73836222420.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160902db12d5f0---53715523175.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b9b8c75475b7f04b54feb112f388e719/duwomul.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fec7e3c9d---89724571856.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/danide.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/965b498b380ae4ceb2f00abed7a6f19f/voparok.pdfIn PDF document text
    • http://ailizia.com/userfiles/fasivajebobufovupetemaw.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/geganune.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/mitimufukufijovudesa.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/52758626294.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/16658813257.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/07c5ec4667866de1d8987b7cf9ffa3c6/85030521901.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_off00013688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13688 10428 bytes
SHA-256: 863dcbe6d7f43333a5ba4611a919e57dc3c6de8202d7b68f6a768d260e811c96
font_01_sfnt_off00014de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE2 14980 bytes
SHA-256: 8a6fe6de7d0b32fdb58f007dcdf923f947c5fcc28e5d8ab82f2d83369113ed97
font_02_sfnt_off000173e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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