Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8c375a14349698…

MALICIOUS

PDF

87.6 KB Created: 2021-09-09 05:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7cfcd3b2295baeb3a04243f17b08c2ac SHA-1: d197f4e07890d40e8fb15ee333f105ae8acb724a SHA-256: 3b8c375a14349698a4978b88002755fb662c389e5c87ed99a421459d25dfcca5
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. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=sword+art+online+season+1+english+sub PDF link annotation
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/18737617332.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4b2143395e957fe7c30299a1b60f84ef/vibonididamoke.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/kenubutonefedo.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/gexenarolebokuderun.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/d46kirgphpgm6a4q1j62ui287l/13473862874.pdfIn PDF document text
    • http://konberdbio.com/upload/files/68045664866.pdfIn PDF document text
    • https://digireg.it/upload/sagefu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/4c97766a1ac99ec66484084277827db4/gokesitogumepufi.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/levefabagevivemener.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/53464127752.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/zusijefegilajasujixariku.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/71990120477.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/203a40642405066e6126eef9ad6c5fde/23121942496.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/kepeporarut.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/toder.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/31354247626.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/58680c99bf4c8c72f790ea08d2b7c976/buzevamilebujajobolupaxo.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/zazenewagebasibutugoz.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/zijonudilukulisuwokivaw.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/mozemitobiwidexufo.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/lepaxexagoke.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109041356521547.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161330d254eb6e---13973241218.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_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10930 17864 bytes
SHA-256: e6f8dc1293106fe792557fc242d16f356889f8e853689758efe011958d08ee51
font_02_sfnt_off00013736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13736 10980 bytes
SHA-256: 7d94d5e38e607912ceaded60702b487228cd88563865559ac9277ce064f52302

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