Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c7f04076aa797e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 08:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 313927e77fa116acdd1e35fe567579b2 SHA-1: 2ace5c1f84f23af922cb9f4d55929741885c3527 SHA-256: 89c7f04076aa797e6ac230f1cfe6afa26cd623e776711404b8467272b75b799c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the link farm. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/18234153046.pdf In PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/98457983826.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/61712519616.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/12642666155.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/57592091707.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16133558c4126a---73210945794.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/76079006246.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145498e99ac4---69300675320.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/dodexox.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f233f24a31---39234656310.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/14974354868.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/75488390298.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/ruvimelowibeta.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/66965637359.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/9026594785.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/86546264726.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/27530854101.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/tokow.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/21364916124.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109010526261130.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/regesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=legjobb+aut%C3%B3s+j%C3%A1t%C3%A9kok+androidraPDF 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_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 17488 bytes
SHA-256: cb117666d45f66f91df10502bb64533b6b83156f648c5a33ae5d08fa052f40b8
font_01_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 11268 bytes
SHA-256: 9ca866d6f67265794f82425b362be890224f8460321490c72f868b2584822aef
font_02_sfnt_off000124f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1