Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff01ed4cf5ae64e1…

MALICIOUS

PDF

83.6 KB Created: 2021-09-10 09:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 233c0b0972f06a1738c40ae623ea8119 SHA-1: 3be4704dd905a25aaee94cb6f89c4b1b66a299d2 SHA-256: ff01ed4cf5ae64e10594e4ee97a66e6df6171d025c2c9f869a452fa3e31688fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload via the embedded JavaScript and the numerous links. The primary lure appears to be a fake download link for a popular game.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=breath+of+the+nes+download PDF link annotation
    • http://wonderpanel.com/app/webroot/img/file/38497250005.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/tumelibolowor.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/litisoguliwuperusol.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/bosagibigotojevi.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/67522769430.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/nerababitesebegu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613048e0605ba---5658838866.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/93d40ec9e6538b77b08a100e54283f6f/deziwosavanu.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/tabofesorubozizobubuzexow.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/mebodugeniliruxubumite.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/pedigojemewomuxegumunox.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/52301872997.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1aad85ea---maboxoralikoxuseg.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/demezolefokovi.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/zobefepoxibineguru.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/91307206901.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/81865116639.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/70164699412.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/34414939753.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/pofefulupoduzobogaxas.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/36070188903.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/86736180313.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109091916035137.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/1014297578.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_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 10496 bytes
SHA-256: eed9846b8abebd8b3d977dcb8b6d2b5af31fe6c603b26d2eeac4b532fdcde7e6
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 17892 bytes
SHA-256: 77a134e8452e04e103466aaa297a2a7c1c8a150e2d0d64cfe2d80fd9ddf7051a
font_02_sfnt_off0001289f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1