Malicious PDF — malware analysis report

Static analysis result for SHA-256 536d8232d8e36328…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 08:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3da3f885e87a2991e6d5ffdaaa07b95 SHA-1: 08371f3d5422260f948f023cb15882809db3912e SHA-256: 536d8232d8e36328ae4ac803cf44ca425ad9b263e235b3c964767ff186a3e7e2
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, forming a link farm. The ML classifier strongly indicates maliciousness, likely due to the JavaScript's function to redirect users to these external links, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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 http://theultimatemarketingsystem.com/survey/userfiles/files/68850105234.pdf In PDF document text
    • http://www.binghan.my/userfiles/file/16324055449.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/pikivovixowusesawolejit.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/74243324091.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/0rrm580ffs11jvsrafe6b34ss0/11826196417.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/8739438095.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/warese.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/mijipogivosanojojavive.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608faac5ed83c---99431392013.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/22531489741.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902b7d24b82---fekefegumures.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/ganupefutusewuxejub.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/soxagozerivuw.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/mobokuxibebe.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160756952d3890---jevejezifowukavetelod.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/xekawoluk.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9183d8c30---judademepifepogagime.pdfIn PDF document text
    • http://htcable.cn/d/files/babazowabuwedopewure.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/lobum.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc01b61ce9---68768778325.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ecace12f575---relusumijuno.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf09b3942---665441878.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f14d70c2bee---15738119322.pdfIn PDF document text
    • http://czyxchem.com/upload/files/4551132682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=carrinho+galzerano+maranello+manualPDF 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_off0000d37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 18580 bytes
SHA-256: 6d0479b9e63bf8bb4ed0d0b16211a2b3515c65562d7669e38ab45efd7f232e05
font_02_sfnt_off00011a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8B 10480 bytes
SHA-256: 5fc1cb2b6dc1621f76dcd15be86bb538938ccab7b66f6704ae8caae3f2069b68

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