Malicious PDF — malware analysis report

Static analysis result for SHA-256 e410ffe783009471…

MALICIOUS

PDF

88.0 KB Created: 2021-08-14 16:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c3c9a4d7c68166397654b574ee5e28c6 SHA-1: 7a93a07d3d8e9c375b9083b14b64df344963bc85 SHA-256: e410ffe7830094715c7c1dea35f0ccf84b86548352b9310e7a72a3241bb49d9b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites via a spearphishing attachment. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kystop.com/wp-content/plugins/super-forms/uploads/php/files/53naul22apsuuq43fe2nk9ajq3/tebuke.pdf In PDF document text
    • http://ruresept.ru/files/file/femusurozarumatufusemini.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/08bgkbhmfs34gm71c3fo97bej5/vegake.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/35461843062.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/zovedakilibavosake.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/dosidiwikoligepowil.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/wemasolakujizel.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/42570622979.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/41253983849.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/65166769902.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f16f5f0faf1e94451360118119cd37c2/15311643419.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/juruterulalok.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/62307599069.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607117402c7c9---99227000415.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/3909631942.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/cd65c357723ecbcb0f8ac9ef1f8aaa70/12632522256.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/198213b5867fdc69bf9a8f5933f4d1f7/saboxikagavogepamipaz.pdfIn PDF document text
    • http://vodnik48.ru/content/file/wezotolozorij.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/satesonediwopexijitoniwid.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/14714336720.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/kejugagodoxiwer.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/vawunod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=estrategias+de+ense%C3%B1anza+y+aprendizaje+carles+monereo+libro+completo+pdfPDF 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_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 19268 bytes
SHA-256: f521b3344fa68b498801be8001d5357d978c3673ca629af13919fdc64de7efc6
font_02_sfnt_off000132f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F6 11596 bytes
SHA-256: dc4d213f0a011e8952c107650f25fdbae380958edfa6e8f2e311ea2ddc65ff75

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