Malicious PDF — malware analysis report

Static analysis result for SHA-256 101b72a47be50e0e…

MALICIOUS

PDF

70.2 KB Created: 2021-04-28 14:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ad4f5336cd931d24099958cee2d44d5 SHA-1: 31e6f28a13d587e5835cb4ac7889860974fec9eb SHA-256: 101b72a47be50e0ef07d3786cb4354751c0b13427860bd6727cb97bb4c497382
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple embedded URLs, many pointing to PDF files hosted on compromised websites, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'bmi calculator apps', potentially serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/8bcd3fbb4efb39075a8922b7cd846758/6431463516.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/785937650b92d599db6a7dddefa2223e/19940236613.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/57182fd7851440d45d6a32e86501d83c/bafurolarupalolufixo.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747b3929f4e---6780757695.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608179a540321---43323334769.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608842927ffed---dekesak.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/18e67af8e37ae39dc094dab347a89ef5/kewosuraderegid.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2k6us6asqhpou1j4e1k2deo5f2/52342662736.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160781ea5b190e---70036686154.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/50f34342151a160b7fc6bed23c446a82/muwebuvagijufi.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fff1be4ae0---rerulakanizovexun.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b280b849---nafapamatowivozuwapujitop.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c67087fde1---folet.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/688408c483f0f88d7a2775103df92f3e/nageguvarowejexekikumuwat.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fe2e2826---2266471732.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bmi+calculator+apps
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7fe.bin
976c1026e4147b6458b72410340c2c853ac6fc994f4e627f2b27486dba779da4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 5128 bytes
font_01_sfnt_off0000e951.bin
e8b5068de7f3552fcd1508243da31cd329c21949b4f0d69c02f2e4d6d46193a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE951 10276 bytes

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