Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e597ee496f7145…

MALICIOUS

PDF

73.7 KB Created: 2021-10-07 12:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a56cf0675f173943bf3078e65ab9d477 SHA-1: 1d27a59c4f4ea41d108d7b5a1119948c6cc33ba7 SHA-256: 62e597ee496f71453a5798126d96b3ceea150f45d693776b3ce6503d796b8045
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a malicious intent to manipulate search engine results or redirect users to malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://cructi.ru/uplcv?utm_term=what+is+corn+made+out+of PDF link annotation
    • http://shyjjc.com/v15/Upload/file/2021919233441725.pdfIn PDF document text
    • http://flirdining.com/uploads/files/5407096062.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/15739924807.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/63160195088.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/vobeneji.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ab82a410ec825f232376819e384cf86b/jumobezijomewavobopol.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/galimolugogizilupoli.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/46601380834.pdfIn PDF document text
    • http://www.520amis.com/upload/files/76258919632.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/surazonok.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/lovozafivavibutiloso.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130c13aedc85---ninanot.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161524bced4228---47585070564.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/28147962866.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/27486813535.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/biputanibu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2d79594589e4eb766ebb31c62f95e685/83337153634.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/27981553919.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/93811986150.pdfIn PDF document text
    • https://serka.com/serka/upload/files/84034450356.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615e19784ccf3---xamaruvemuzu.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/37491708084.pdfIn PDF document text
    • http://chicopharm.com/upload/files/koniwunigomopelowilito.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161582ab5cc3fe---reruvaxutigavukibujubupuj.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_off0000bda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B9 10788 bytes
SHA-256: 481186e974eee8be4ebea0a3145a7e6f321553b4fe2a4b3fe6d3b6adebcd9993
font_02_sfnt_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 16676 bytes
SHA-256: 340d099e75f75fc4f8962632f6172975122e68954edeae02b47414ab9fc16434

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