Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6349be5687231ff…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 13:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb082808b8285d2bf2a3fdf31e09edf0 SHA-1: a63fc3e39515ad290e29383afb13d1eb41265f43 SHA-256: b6349be5687231ff7a1206688c8be9782ec399d0d61680b202ef18dd0d375db8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=not+receiving+mms+messages+on+android PDF link annotation
    • http://sjzhtchem.com/upload/files/1978649158.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/tod28mtheqkb6g19tfi9maf5sg/lafilekazatusada.pdfIn PDF document text
    • https://photofetimages.com/bewawevisidupejefule.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/83170596436.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25022366327.pdfIn PDF document text
    • http://cartopack.be/Images/file/gozikatiw.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/1973510572.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/26184196832.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/40226183222.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/kodobivamozobinejikidok.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/71541836720.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/49724035096.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f6fa8f01dd---finujuvinazosexuwo.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/9233445219.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/banegaviwa.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/acd5p9teu7fs53hu3knc4ooq34/bepivufatonadif.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/zumuposokofirozunafeg.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/bc8203a673b23b4afe78548c258b9e68/roretugesigosudebudefig.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109161910253919.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/27311321348.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/1036799487.pdfIn PDF document text
    • http://szcftz.com/upload/10600216993.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/salojuxokajapupatesabupu.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_off0000b43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43B 18660 bytes
SHA-256: 9325e347985fd991e4956b09ead3f1c606bd505bd58e26c8c3149b2ffe185848
font_01_sfnt_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 10712 bytes
SHA-256: f54917a666664200e1bc6aedabee7f8cea1ac22b7a94cb60609599cb273c1ca6
font_02_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1