Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1eefc1d69ef2a02…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 05:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 123bcc464f2477b294729b7690c3185b SHA-1: 34ed1ff95bbe5d21475e4ea3fb2022fd4e6d2b68 SHA-256: e1eefc1d69ef2a023c4044dde7bf9cb0399875aae531033478803561c98eb060
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream, which is a common technique for executing malicious code. The PDF also hosts a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

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 https://philabc.ru/uplcv?utm_term=como+remover+servi%C3%A7os+tim+do+android PDF link annotation
    • https://lomasdelaweb.com/userfiles/2008.09/file/dunubate.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134a8510bbb9---97909311126.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/lubekiforovodinovazise.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/72131294466.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/gelarubenaxux.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/zoraxazovusagibager.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/72192283571.pdfIn PDF document text
    • http://bushurov.ru/images/files/81468338746.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8cf020b22---gotelemapo.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/xorikusoro.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/nilevisonujugafuluzevafig.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/xiwesizupekajaxipito.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/momejotopobonone.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/8266320663.pdfIn PDF document text
    • https://derfo.info/resimler/files/71036772385.pdfIn PDF document text
    • http://langmypham.com/luutru/files/xolenozerelimelagaduja.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/gotuzosokufatese.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fde6e2c98---vojekelatedox.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/q893ko23mdvrk0o4m5jric11h7/13463881793.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/pajasagoximada.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/gapatajolegarexipuzapivi.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/71402722542.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_off0000cbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 10656 bytes
SHA-256: c6c51f6373ccdeb78a50cd44d5bf959a54c8641ddc7c1609f3c1bc955b0bbebc
font_02_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 19020 bytes
SHA-256: 2bd92c570822bbc0d3fd8e181e248afc54c483d3b1c723be684ddbe404cde423

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