Malicious PDF — malware analysis report

Static analysis result for SHA-256 3861b3fdbd44b51f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 15:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 82f533222e21af48ab2b73a536f38b14 SHA-1: 31358709567974f212adce6fa55e909c90a33879 SHA-256: 3861b3fdbd44b51f357110686d0cf4b01402d2996fd5018de200eb01dd99bcb4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the document is designed to attract traffic through search engines, likely to a malicious download or phishing site. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities, contributing to the overall malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://garglob.ru/uplcv?utm_term=car+parking+multiplayer+apk+download PDF link annotation
    • http://duz-drustvo.si/uporabnik/file/41503258258.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210915_160925.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/bidisiw.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/rojig.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614112ae5c849---73173604367.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/bekobopexo.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/ruzira.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/33496401631.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/nilorimonugijetasem.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/50846317472.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c2b233688---lowofifosoraniv.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161409583920b1---rurisumup.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/62151468589.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/rotifunasijo.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/guzesijobin.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/69852957180.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210917203548_523140460.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ccec73f7---zatirewizedexebuxaxe.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/36215362449.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/vamalosowal.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/63740193550.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/woronerekidoto.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210909043316.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/25196889278.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/40967330097.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BB 10988 bytes
SHA-256: 2e48966af7420a3bcb4ea1f611db86c447d59a4f16f00be2bb898697d8ca23a7
font_01_sfnt_off0000d118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 16348 bytes
SHA-256: eaecd8d8fd522c10bb6c38e7bcc7847058292b0b1d3079742b93441128788822
font_03_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 20376 bytes
SHA-256: a150bf58622c56a614dccc5a8dd4111d99b9bb8a707d8c852900208e3ebb7cbf

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