Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e71fca56e9f56f…

MALICIOUS

PDF

81.3 KB Created: 2021-10-04 19:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bfb20fcd17c82f948645a5efe3cc8387 SHA-1: 8d7e910e6d94158b766c7b3c314fe31dcfb6d6d1 SHA-256: c9e71fca56e9f56f4ca37284733a65e9d58bb1a899cf2cd7b4873eaa67d62fd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or initiating further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://galaxytraining.examinationonline.com/files/4861310951.pdf In PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/35783322015.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16152464b4e878---matapojuletarilinomivas.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210914190133.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/87513957209.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/jawotasiripalejuzubulezex.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/zuziruxem.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/zibepixirubiwotap.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/winisolaveg.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/posowiruwojupax.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/davupopujoxatukosemijuvok.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/siwebumogigagejovel.pdfIn PDF document text
    • http://honghuibio.com/d/files/faduduzuno.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/92866228475.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/joranaravum.pdfIn PDF document text
    • http://com123.vn/uploads/file/rirekezewuturubopozunazig.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/muririxe.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/juxarefokovek.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/soninojij.pdfIn PDF document text
    • https://soechi.net/userfiles/file/92948935536.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b66aa20c7c32899506db7ed6253faaaf/72268359803.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c48f310a5fe4e39c25bd09202f9ddccb/50572400164.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/83036574007.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/698abd10dfdd5ba5fc0c71e9575e1cba/vawofofuvilojufojowudin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=curvy+curly+chrisy+onlyfansPDF 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_off0000d3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 10516 bytes
SHA-256: 62fa9b3feae97fd634baf09a3e2f7735f7af4c9dd0df4ef43c90b13ee70379bd
font_02_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 19740 bytes
SHA-256: 2e24156041de983feee0ba425a37216c7dd2ff5befb6d59b2538a3f4d812002f

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