Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bad1224adc4457…

MALICIOUS

PDF

84.9 KB Created: 2021-09-21 20:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8f88196278ba1f594a1b91c2c143af6 SHA-1: 5acac7e65aacf3cae74089e4e834fe84517b214d SHA-256: 83bad1224adc4457f741d9953b2a0b25626b957efd2fd4f0e7bc6115f79d5abf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=code+for+filelinked+on+firestick
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/ritokuvikelodupewana.pdf
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/ximetowodamijoxewose.pdf
    • https://orderpoet.com/ckfinder/userfiles/files/xatuvogeluvanilej.pdf
    • http://iburgisidimarsala.eu/userfiles/files/gufibifeketera.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161418c29a2282---goxenojotur.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/1792058474.pdf
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/66175945279.pdf
    • https://mayxaydunghoangphuc.com/userfiles/files/malajagapab.pdf
    • http://agnieszkapawlik.com/userfiles/file/wolelabaromutogorase.pdf
    • http://locthanhroyal.com/upload/files/bujuxirarijejofaxobogofiw.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7b401f83d503dd18c417959a5017ec73/91577447921.pdf
    • http://cssh.es/img/file/lususobawudozaf.pdf
    • https://tonerihned.cz/userfiles/file/53321088468.pdf
    • http://rfaaa.com/UploadFile/file/20210909011106270.pdf
    • http://pwmtqatar.net/userfiles/file/82226720794.pdf
    • http://findmecakes.com/userfiles/files/768153169.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pijuwidisodu.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/31348534531.pdf
    • http://tamlaproject.com/userData/board/file/27781974992.pdf
    • http://byecook.com/ckupload/files/82866994459.pdf
    • http://taemyung.com/data/upload/file/gimamulozifisabotep.pdf
    • http://www.greenfield-sustainability.com/images/files/wonetuzumovod.pdf
    • http://udokutscher.de/gfx/userfiles/files/donoperagewemux.pdf
    • http://leadingedgecorporate.com/user_images/file/genemiwutofevinopux.pdf
    • https://marblo.marblobaths.ph/app/webroot/img/files/tozoziv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f6.bin
ff84d729c062023f7e066b557db5662b6f9397178b09aa469dedbcf2e5b2b791
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 19036 bytes
font_01_sfnt_off000115fd.bin
abf1e4a6587ad805a7a22308802b53cb056dbf52e9c698d20d5d2e525fc949f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x115FD 10428 bytes
font_02_sfnt_off00012dbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBC 16792 bytes