Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6c3fcbb775161f…

MALICIOUS

PDF

75.7 KB Created: 2021-09-13 02:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b82e03a11a9367d838e4a8de1e7ce85f SHA-1: 1bf1e93c7258d3c9bc985ffc08def91cd449b89f SHA-256: 9e6c3fcbb775161f974ffb9b5357ea66d67921caaa92e7337dddb119e6c8830e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://garglob.ru/uplcv?utm_term=bubble+shooter+java PDF link annotation
    • http://mptech.vn/ckfinder/userfiles/files/78877679493.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/96926878255.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/24872750324.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210909180940.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/jororonizumukipovu.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/mabajusi.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/77036887790.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/69836523549.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210912_3AD9F4226A343F18.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613391c9b6727---pakuduzesilofa.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/70808836949.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/83197507210.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612f219cd94a4---gujokenutukixapigamozufiv.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/nexogojonorudarinut.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/wowedegifokipukefej.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/taziwijovulubuti.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/45308815678.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/93151937883.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/30178320745.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/59531136953.pdfIn PDF document text
    • http://ranchobg.com/img/file/pajuwizowetuje.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/vakiwakaloterusojapit.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/rinelo.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381415a18de---99444761669.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 17012 bytes
SHA-256: 6bafa0d115dc941f3ab7f4f26a235732e43f34112315cdd7d3ff97393f5aedaa
font_02_sfnt_off000109b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B6 10496 bytes
SHA-256: c3445b32ce76c3aaad8deaaace3e3a3c65c6f043c763d090b2081d05abf33ba5

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