Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb2ea3516c7614b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 00:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e6cba9abfffa938abbd9e3f87f334e4 SHA-1: 3eb1eb5d32209010e68a9288b3f1c791f654c31e SHA-256: adb2ea3516c7614b399e93fe6308087146f0caa56615b2a813133d586f1857b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=11+trillion+in+binary PDF link annotation
    • http://air-ned.com/uploads/files/1988786509.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/resifepobizoruxodolel.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/xujumimo.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/besakuli.pdfIn PDF document text
    • https://jin-ji.com/upload/files/zurudob.pdfIn PDF document text
    • http://dobermanncz.eu/files/gugipimexumixoru.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/83240684619.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/xegafirenarop.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/retigagesabumu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161315c1b29a88---setuwatuxijaxubi.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/69838115826.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/24896895050.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/53799492837.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/wukuwukofusenaj.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161454fb3f0607---worut.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141af5e3a301---tupazafukigat.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/lejetugokalejel.pdfIn PDF document text
    • http://atek-ent.com/upload/file/97144793475.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/jijepoj.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/40af228ad0dba3d7c0571d74ee7a9597/bisur.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/xatib.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/68100730990.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_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 17892 bytes
SHA-256: 9bd0358ab50028edfd6d189fda36a87d6c42d27b94171b342ded2d0fe5bdb7b7
font_02_sfnt_off00012dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAD 10012 bytes
SHA-256: 25679aaa37417ea91e8564d80dd2d1fcc59dbe82e7e14ccda25dd85cbd31ce69