Malicious PDF — malware analysis report

Static analysis result for SHA-256 e268d4c852f75352…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 23:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f3e1cf5e45c803b740d00e4db116689 SHA-1: a2f1225bc4c6dbd8576c487f406ae8c5f5b11a67 SHA-256: e268d4c852f75352c00420bfc8f14e8e1a4c3c215d60e9c1d705e747be5dee64
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains flagged as compromised CMS uploads or disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure suggests a link farm designed to redirect users, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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://aucoindeshalles.com/menu/file/89325199954.pdf In PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/n1n7itnd9fg044k7fhaluvcnaa/9268683754.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/b8f2kmqpninqucbupqhjmg777k/japewimuganesijowiv.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/givilutilokufegale.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/89973956520.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/19729446689.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160858610662bd---42502091839.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c02980cdd9b---81147463272.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/b5bdb0dd683e697dc0e288c6064c3c9e/18060393149.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9jve5af85bfdpehmm1vs0hg8a4/37830593745.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/26413281390.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/wikedaxere.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c5e45ce82fddbe1fbcf7f693e01bbf4d/70557381137.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/8hnq1ef0oifdk917dbqh38vhe4/gubavivativurige.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8aef518969dda0734b5d66b470bfaeb4/14060333974.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/197965193.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607197ff7e24e---16058845381.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/20685984090.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/58691030899.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/86752271660.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b90d6bb1---17554548188.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7dbb89ad05---92484211270.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/93803438443.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/24580789249.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/1600815184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=petroselinum+sativum+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_off0000bb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 10828 bytes
SHA-256: 52115d2328e6c4af1796c0e5505ca637c6e0eeed8f38ce87d93210d88317952b
font_02_sfnt_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 16492 bytes
SHA-256: 3b54d9c86595fd64e01e60f06914bd260b57fbf1ec708e55aa30f0139249a7a6

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