Malicious PDF — malware analysis report

Static analysis result for SHA-256 725537bf45e52ece…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 07:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30052fda08b9bb0f3ee23a424f546d08 SHA-1: 236a15030433fc48a348d6924d9f2aef2d514481 SHA-256: 725537bf45e52ece6a81253cc614bf061e3f2dd60a5d4161695d1d61519e6e40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites and disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of link farms on compromised CMS uploads and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/aff13de601dd5413de2e545503220d7a/xesuxatot.pdf In PDF document text
    • https://kede.org/userfiles/file/bogoxemuxafutekexavefe.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/dirudanafaxasim.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/wulox.pdfIn PDF document text
    • http://hzqzg.com/d/files/gipolawuvipesovosuledeba.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086ac76e4ffb---jaxodidepezapagugedomo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e33eef11b968ade90e5e18b52fd58973/93369014138.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25785cd23cc7dac100c066c72d197105/6236166663.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-1/20210901232954362929.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/1c1523dd8309add29b16ad90e4bf8b5a/jukatigim.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/padafujin.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/rcej8nr0u5h7rmugsbfnoi6do6/dinuxematevijisipi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7db293194---27145736868.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/87271f91d10de15d1f32b1ef899c6808/bideteruj.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/803409f5c69dd01942d719151ed7a847/mexidemum.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/zapimowikigawevikexona.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bcc107203---mipofapojofiloxer.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/95627109170.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/nasosun.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/88761734360.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/pitasexanu.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/39923145220.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/zutup.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160916cf0e3010---68194574262.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4c96b0f45---takoxixes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=presence+of+god+brother+lawrence+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_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 11032 bytes
SHA-256: 040fcee8c7f49a69d443322e03ebe71735e942737d4c9c3360018d6fad096d52
font_02_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 17460 bytes
SHA-256: 81c7a4cef4f6cedfb6f9d043610fdc67ec16fae9d80f2fe023486e02190ec9a2