Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e975bb141e4761e…

MALICIOUS

PDF

70.6 KB Created: 2021-09-20 04:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25049f8db6d9d3bf1dad253cb4b80edc SHA-1: e2988ec12cc7ff365a414f33b965b1dc214f8f0b SHA-256: 4e975bb141e4761e9a6198af028ed588766c0e8a4ba9e0d6db99989c264e8cf3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with compromised content management systems or disposable hosting. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and heuristic firings suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6954

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://oniceh.ru/uplcv?utm_term=tom+cat+2+apk PDF link annotation
    • http://generaltubi.com/container/ckfiles/files/63456352689.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/sapopawopanisowidezomakut.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/87602810588.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/vokinipoboforo.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/pojiwuwasumikol.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/de3bffb3ce80e252e91fc0f2fb39917a/rebenaj.pdfIn PDF document text
    • http://afslab.asia/upload/files/28687770519.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161316a26c0e50---fobawutedamit.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/71360262384.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/79225449329.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/35511600436.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/23366862962.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/lavotej.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/mazob.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/sugivotimovonurakipaz.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146bae875412---743078401.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/xogivew.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/95519603063.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/wetoditijolewolazuguxuxe.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/66562561318.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/zatufulogumoxizar.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/tagilerafef.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210911005347_7m2opr.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/segenolizezuxufumewerona.pdfIn 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_off0000be45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE45 10068 bytes
SHA-256: 240c62f83da62ca07d1316c3c931a66a644fb7b1cf8fd919e39d912e1b06d70f
font_01_sfnt_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 17392 bytes
SHA-256: eb49e874a0baae486b452f1779ea258e6c5d565cd2731136fc4090fe7853384c

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