Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1de8227f08fa5d2…

MALICIOUS

PDF

77.0 KB Created: 2021-08-28 10:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86b61b33ee7889c049922de8b4aa9b42 SHA-1: bad83fbca92032182791b0582ba1b5eaea985467 SHA-256: e1de8227f08fa5d2e009f8999b5b81c9f72be7587fcab070140ac50b7756d10d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised WordPress sites and disposable domains. The primary function appears to be redirecting users to malicious download sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=game+of+thrones+guitar+ringtone+download PDF link annotation
    • http://tomaszskiba.com/userfiles/file/479844281.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/52081193704.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210612_022140.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a08081c9c2ee1d68cfc53af2a03539ed/pomirarevawab.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/tetipuzapuxalip.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/jipatanozibipame.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021061812531473499.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2e8c84bfa---susaludasagozeritolikazo.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/25747795169.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/gsdce9k8chgde9kgtvrriupd72/48521132158.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/65038471408.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/b028f1d66c0929a230141a7a04c49f4e/57711144128.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/rixusojexagoxibusifumid.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f1de21045---79092745213.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/40074936027.pdfIn PDF document text
    • https://tcremich.lu/files/files/danudokupigokavo.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428104910140.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/jabevomugerusizaje.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/32828689454.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/035a48b905bd65d7cfa67ff93f97b3a5/jamasesowomobiz.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accfd8e1441---55709209233.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_off0000c68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68B 11024 bytes
SHA-256: b78101546deaf7ce1e0f6770016458958c6b22f09a959058f3a8091fccb9c43e
font_01_sfnt_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 17420 bytes
SHA-256: 79841fac3a447c3634f466683006300969c9f9134369257b33f619cf2d5b2b8c

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