Malicious PDF — malware analysis report

Static analysis result for SHA-256 365f4aacc634cd1d…

MALICIOUS

PDF

80.7 KB Created: 2021-07-16 06:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2ad678ff717ee55bbca6cba2f85261b0 SHA-1: a502e52ef866b2604c87616f600d421291d8ca69 SHA-256: 365f4aacc634cd1d24800735cdfd73d82899723f47d1673fce5b7ed37e25cac0
156 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. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of these links points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8e6d2de48a8b3e581f352332434e784e/zaterifevuneri.pdf In PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2b1014459---73120812856.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/mugesutewurabajad.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/94enfrtlkhnaldjtqio7qolf67/73421877797.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/burokeginalemiminewelul.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/51798906397.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tsib1vp935g5vnm159bcqtjrp3/98902947053.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/10b5ec3586ce1a5eec4652fd3135d3d3/44826401824.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/gezoteloxunaxegi.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/muronifuzitebepufumirul.pdfIn PDF document text
    • http://siembra.me/uploads/files/52911732393.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/lunaxutimadojepurerofa.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc9c62460d---jekutanulusa.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14e9cbc58---tekabasumavafiwubilakovu.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf94dc2a5---daxelitezi.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/dagobagi.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/gujewu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a773700440---40852057909.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/31105555060.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/41881789033.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/25076993081.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609baa3c15a8d---lutuforini.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e6e62259c425b299c5c879026df98826/83849536015.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/57433145681.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/31027728474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+lock+fillable+fields+in+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_off0000d696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 10824 bytes
SHA-256: f3d9d0434172a11c4d346628a4449bef1c63761e7b3f4efd8170b08a96def65e
font_01_sfnt_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 17404 bytes
SHA-256: 87f51084da6060ef315dddc12448ef3d0825c2c282737ffc63035b987d6ba6d5
font_02_sfnt_off00011d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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