Malicious PDF — malware analysis report

Static analysis result for SHA-256 2273525bdd749c96…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 15:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efc824dc1b3b5ba7510e3c36f031a320 SHA-1: f41fcb54b9ebc944eebf66d105b872191482bc68 SHA-256: 2273525bdd749c9606d348d5956a18a758342163352e705726e0fa68350654a6
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites and disposable domains. This behavior is indicative of a link farm designed to manipulate search engine rankings or to serve as a distribution point for further malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b597168c5e7---67268884496.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbbd6a0e4f---3930099181.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62fd4c372f---60791102814.pdf
    • http://yogo110.com/userfiles/file/sibuvesuxepun.pdf
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/74543732723.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4de7da4b---ditakizapezotulon.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f292b21e---63999286470.pdf
    • http://alnoorcity.com/userfiles/file/52347708537.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b0a883237eea356e3fa683ef4e89a0a9/jozemo.pdf
    • https://baptistfriends.org/media/lodorolax.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b9365ccc607---34890742037.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c51eec8432c0ff85b32ccc92804d1940/24572387186.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/83f4b7e6rvonq8nc7pvnn31b17/8394578612.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e8328cf0f56002c00d4bef5c308de7b1/88218864212.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6810ff63---26018204990.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929c6ec5bd3---dilotajumerugifosanu.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab9399e59---putagokirasizovuvotuno.pdf
    • https://faceless.me/userfiles/files/11069637396.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/0708949ea1636b568b64c000318df28e/95968369319.pdf
    • https://ludifrance.fr/userfiles/file/83162313427.pdf
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/36899155231.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c68d44109bd---90979889057.pdf
    • https://mumegram.com/userfiles/file/84182609073.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=letter+q+small
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eefa.bin
325ea02d089ec2ef47eea0dcfaa28dbbb8d342145959a558f1ed7ab6b8498387
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 17572 bytes
font_01_sfnt_off00011c82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 16792 bytes
font_02_sfnt_off00013499.bin
e1fbbe5fefe79f586601a8f37d985285e837aa0d5862f835b5b002b402a9392c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13499 10056 bytes