Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42b760e2c04f7ae…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 17:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92aec84048ef51b02297282324c557bc SHA-1: dfb2afe04005ef157bb7b89b3f6117b6b7325743 SHA-256: e42b760e2c04f7ae83fcf23c7d03c12a93e9428a6ee88ed1c46834e3eaf020e9
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this is a link farm designed to manipulate search engine results or redirect users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://queure.ru/uplcv?utm_term=lakshmi+ashtottara+stotram+telugu+pdf PDF link annotation
    • http://emke.hu/uploads/ckfinder/userfiles/files/detalelolojana.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/7501648651.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/xakoxanipolubajexobi.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2e1fc5ec31c5ab68060fb5a9e1003b8b/xazejiwugisexinexidede.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb80e81076---67332990882.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0e82a33e043878813d99b1f1df564958/pewowagenanofipogetudovix.pdfIn PDF document text
    • https://seikai.jp/free_images/files/venimadosafajarewesosubis.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/3114732244.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/67629278960.pdfIn PDF document text
    • http://ukuleleceilidh.ca/clients/860383/File/6730221420.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/57640318223.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/5427878997.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/potovabulobu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160754475c2e5f---xotebuvexawopabemudaxiwu.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/plur9n66m1u3bos0lu6b3jhpl0/17210422432.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b7df357c---28359870213.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a064e8ac56b---dixesenovunujakavemusi.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/vawisodapuzegutobeven.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/19651247330.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762ebeb099c---remirokegevidanorojimel.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f32bd83766---9590156824.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3deee648cf20c3f4f30643c9cb2bfff7/sexofenurajupuj.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/81827067166.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_off0000ba59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 20180 bytes
SHA-256: 1db08eeb917d818123c20a031899d929181628c0d97c2ddec74b466438903fd7
font_02_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 10988 bytes
SHA-256: c6be6c67e812fa096274ddbe7b9725ca377182d3f9b60c3ff391b5e3654ea4dd