Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d32af721c15c0a5…

MALICIOUS

PDF

115.1 KB Created: 2021-07-18 12:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7968332b399e77ae2c5a404c8d0b444 SHA-1: cf63e77b2b55e622868bd04dba39c1a3133e13e3 SHA-256: 2d32af721c15c0a5e32b6fdbe4fcc3ae366e97a01f44fbbfb3619d2de9427f0e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kuppersbusch.hu/userfiles/files/nagesop.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e1acef3a4---24988518151.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/nc4r3kp3hsi69ms327plns9f07/25376678216.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd426c35f1d---70608037639.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m3amjqsufdtm2rndtvh2n8ve66/tiwazesefuxutuxofotari.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/39f7673119b4a367e1c2c1c8e5b7244f/59562111309.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/57652949256.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/jozukisenez.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4018d9d5a---wilam.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/40884322717.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/495e38e625d6f3c2acc5b08f43048286/tipewameseko.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608469dc321c6---zudubonuxifozemudaz.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/kosifosapotadolivefize.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/dajubutofubanawofoxin.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/rfb18duh9oqj6h090h8sqrtbb7/lotidibifudamuzinekedatoz.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/satufemaxa.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c59e82aa64f---31846946023.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/mafoxata.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/85402087660.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/nepikalilukomu.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b35e18cd2e2e9dc4d2a1fdfce889b8c3/putuxujobixoromusedut.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/13555179854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=write+the+following+queries+in+relational+algebraPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001432e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432E 10956 bytes
SHA-256: a32250b1db385922fef8a2e7527f8029a22b76dfc83cbbe306396c593a26877d
font_01_sfnt_off00015c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C45 18868 bytes
SHA-256: e178b22017f7a6701c3a4f9a36fce6892071acddb9e3f04e8043cae37234bff4
font_02_sfnt_off00018ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6D3 16196 bytes
SHA-256: eb410481a88e74cc6c9ea54a67c36a3bc45c67234100e621c08a4f5dc0ea618f

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