Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b17e924cb49184…

MALICIOUS

PDF

73.6 KB Created: 2021-09-19 20:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6bb1bb06b66c6c7424d3cea4bd0a822 SHA-1: 7075e0eaf53289d956a1dad2a7fd0f34da0eb251 SHA-256: 58b17e924cb49184bb9a6a36dc626ab72df88d7eabd96081f5a1322d9f622503
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Several heuristics indicate the PDF links to compromised websites and disposable hosting, suggesting it's part of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://happysmilecard.com/uploads/files/xopuwumepozumisegugexeba.pdf In PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/gaxiwotemokozaviw.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/saboxudebatipitajozomofi.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/tudadadeki.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d90c973a80---75739792881.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/62012772213.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/pokomadunefedu.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/3480565807.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/51024834866.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341d57a225d---88868226152.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/51860972954.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/tumaraxalevek.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143ecbb547a5---kilekowesoxubatelejigu.pdfIn PDF document text
    • https://rjpexport.com/files/ziwubotojowepilu.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/59291251549.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/64313764059.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/tisonodirotojijumozugejos.pdfIn PDF document text
    • http://jawarakreasi.com/file/24525396341.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/79885433834.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/vilegebadesuliles.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/zumagevelalukadizefix.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/57271423567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mod+sims+freeplay+iosPDF 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_off0000b7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EC 18556 bytes
SHA-256: 80d1831c3d22ce9e889efb203dcb409b8ece2e50fb3a4398f5c4359ea354cc83
font_01_sfnt_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 10564 bytes
SHA-256: 0a950a018247410e5d4390f3e280b39f678907a12b3b67102397ffd240b5d841

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