Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e475a5944110536…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 10:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f21f2e758fef7da767a55f0f9bd1e2a2 SHA-1: 84aba4726c6d3409ee09c1055e2df8350cc8f875 SHA-256: 7e475a5944110536bb670c01d54efc6c626ac1812809cdd86201ebaf4e6475f5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection or exploitation, and the link farm strategy suggests an attempt to obscure the final malicious destination, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://gangnampools.com/contents/files/19896468714.pdf In PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/jepokojexosifefeteroma.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/57269469340.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/1216337816.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/c85f5b88bb112e8e0b7afa134dfabb71/jaxot.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/62870294885.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/87112470103.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ce82e5ac03c9cc633f701ac1fbf78436/17352401722.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/towutetuk.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/vebojosekute.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/xokikus.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/vusare.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/samepevirogogamipotusita.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16140a79f0f93c---17421228591.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/97003974478.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/vowesabagejiwawajulijaka.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/bujesepuperapedid.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/35984383713.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1fbd285ac9df72e16fc2d50ad3c06d9/libuvawewusotupuwekorigov.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/zofonageguwukibupuzafukij.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/98513308852.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/43679165283.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210905053050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=about+time+movie+online+streamPDF 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_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 17536 bytes
SHA-256: dac14d6ae8f4800b565c149997b718b7cc655b304bc63bd1ff3879f43a7b44b2
font_01_sfnt_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 10556 bytes
SHA-256: b6e0665b90ff10eebc2de616859b19a0fade4330a436a8c53c568f20827b7f92
font_02_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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