Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cb2a1e4c140427…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 22:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b150400a5052cead1a32bf38a6d5fee1 SHA-1: 6a30d0b393acb6df40726474392281f02af63813 SHA-256: b3cb2a1e4c140427a5b34bc2c799bfe9ce3e266e1dcf72b30adc94e54cc3beb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://mallncart.com/userfiles/files/67796777943.pdf In PDF document text
    • http://ailizia.com/userfiles/luvulusebe.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/7533937988.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/e5d55d14ad3610f7e8c42bf122c079e5/desefitoze.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/18211292823.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/97399888412.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/94721196017.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7e0a7254---mitaf.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4564ceb64---90396811884.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/km3iuqega3eaefmo13am6ba0t5/wirovogowonanokubojidag.pdfIn PDF document text
    • http://uci.ir/userfiles/file/pobidetuseb.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/subawoximobonevev.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/mirowok.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202108171252238044.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bb6033e2c---naronaparusomifigananesi.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/wopini.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837b548052e---63509509508.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/825e4656daea5bbf72a387b433bc98c8/49773411973.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077fce8aa68d---bexolevaw.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/51790411507.pdfIn PDF document text
    • http://ktcz.eu/files/files/gejafemumibanilam.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc83b5d6f0---mizorunisuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=nabard+development+assistant+recruitment+notification+2019+pdfPDF link annotation
    • 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_off0000d27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 11528 bytes
SHA-256: 3d88a3bf2b26e7730998cd7530abc4e398d7e7d811d386dfa910815ddbc62432
font_02_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 18108 bytes
SHA-256: ffbf543389fcb45b1db3b4cc9dc6f86646b4c2a37825d4ba16cbbbfc8e88b35c

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