Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba027cb298d976e4…

MALICIOUS

PDF

87.8 KB Created: 2021-09-06 11:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0878c5c1c54222f709c82e1a6cce097c SHA-1: 778a088b90150d80d109c094647c31717d99b251 SHA-256: ba027cb298d976e4c352c110848ad6de2cb93af12c6b92178c19f6a1088f3b09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the overall structure and URL analysis point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083efbd64ad9---4270849026.pdf In PDF document text
    • http://ledson.ru/upload_picture/72203217987.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/5790252e2ef51ed62c8646ce164109f6/xolik.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/fatonujununi.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/juvudukamufagonapuluboli.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608223e608b9c---73846075873.pdfIn PDF document text
    • http://mp-journal.com/media/file/rakumametubukase.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607661fd35f85---pulukukututen.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/mekinirukivur.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5c93fe1405d739ff675fdb382867a144/64045010882.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/37623020268.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/bec32fb3e1b3d9b47b487890aa079437/46250321915.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/81083251800.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/25262689081.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/vitivusojofuku.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0877c8d38---39648214992.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bccd23657b5---85432927339.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/prfb93ml7af5b2jvtctl2ruf12/xoleritigowunanemunolug.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/42829461611.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/fisodenatanuwapajenesowe.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/zegokevelegatuzob.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e0084a67db1bf0dbd2be5da14752abc8/25013572553.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e0336cdb7754f4fc4c9b786035226215/wetexed.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/rofumutemavebafokixuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=converter+pdf+em+word+online+freePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8785eeede7440c7006af05a28b689a71/bilipavilekopuxelet.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 18576 bytes
SHA-256: 110046a4df195aba8af58bfee9cecec551e46a5d49c48bdb552406374acaadf0
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 17228 bytes
SHA-256: 9d641f7c07f95bed169fd7ab0d957ce864aca27e21ad13101180a99e0a7c7889
font_02_sfnt_off000120f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F1 10512 bytes
SHA-256: 4ae9503170e991b2ae32a361475c28da1860804252c3a1dee41eeb5f5c938434
font_03_sfnt_off000138e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.