Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e3410bcd36f7a5…

MALICIOUS

PDF

95.2 KB Created: 2021-07-02 18:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 185d568f30dfeca0b38e88d2a8124aff SHA-1: ab6b3289ea8699045673d4ebf026e1c80ab4a101 SHA-256: a0e3410bcd36f7a55053073b2b55b1e5a804eb39b7fd6a6aafadd0c33e039e8f
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust through a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://jnafarms.com/clients/864068/File/zezokogabax.pdf In PDF document text
    • https://lawina-radom.pl/files/file/19415155445.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/6977cd1dca7e777a62af387d6870b25b/15370126143.pdfIn PDF document text
    • https://birudongker.com/contents//files/fefedatutix.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/54172704342.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aa03a4517---6102392320.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aadaa1f41e5---24320342625.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c2168dc4a274975672db5b64ce247ca6/41076491844.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/21225060201.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/5ff8af8eded8528be579a3053f7b3450/ranupafena.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16075defbea905---lupakukinijopufitasagam.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0044e746---sewomotejip.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/kalofuzin.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882a9a4f6bf---78697175603.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/duviwogux.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/24407e22f823562c1f765b043631c95c/niwipomisadavuvatosifamez.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734c5337d33---79606783065.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a17666917f---vegopowelidoz.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761274d5853---32199055989.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/luxekuxedumobojazara.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/43613436362.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/rgdfmr68jg3mbk2637hiav0rvs/rolexarexinufobozowoliji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=functional+phrases+for+adults+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_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001281a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281A 10796 bytes
SHA-256: 9e52e7468dfd0dd47a5a8fe4383330b28730ff50ca318afb2be73f624fb6f6fa
font_02_sfnt_off000140dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DC 17832 bytes
SHA-256: 16c384b01674773c635f241b3f6d0874f4eed737d4944e3dfd3c69fea1a338bb

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