Malicious PDF — malware analysis report

Static analysis result for SHA-256 94dd91ffbb0bdd16…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 12:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 27f90517c601ab8a2f8e6fcaf7a9d18c SHA-1: 86c429c5bd0dc0420ae7e34c3f73b018fd3f5e75 SHA-256: 94dd91ffbb0bdd16ef869fd123449671f4c1b72219e067ad4236258f44e2c88d
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be hosted on compromised or disposable infrastructure. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF link farm heuristics supports the conclusion that this document is designed to redirect users to potentially harmful sites. No scripts were extracted, but the structure and URL distribution suggest a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/76142973419.pdf In PDF document text
    • https://jin-ji.com/upload/files/41073922341.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/31030974240.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/69108466128.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/44330125386.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/kenabewi.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/pafexamatevimi.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/nulovajufewuvizulawuvumo.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161391d47cdc06---disesifolazema.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/40128472369.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/52986354940.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16151235cb2318---32319955.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/lonitojinabojatu.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/18919821839.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109111000472205.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/zuxabupabepewikitoju.pdfIn PDF document text
    • https://hirurgija.me/files/mijigajusogin.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/584892876.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631148879.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/badutixuvaliz.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/62215332149.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a2e98feb7da2f92a98885dcd150b43d0/nazojolo.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/figiratukanote.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614980219a0dd---12748431609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=infinite+summation+calculatorPDF 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_off0000b2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB11 10548 bytes
SHA-256: 784c7ccfdcb63e4a671be2e7bed0b859cd719705ccffacdd2a09bac74852b7ce
font_02_sfnt_off0000e318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE318 17116 bytes
SHA-256: 8d74f1615606e04e4357d5de451e2c21bf26b416000ce2579dfdcbe7b8ca8fbf