Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b59c721f3ac293…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 09:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2db0da3f89550b0cd4830c2a7f3260e SHA-1: 7401a1be9e0790c2f3eaf768dad9959084bb0d35 SHA-256: e1b59c721f3ac2935ee46172416f9e828ad385ed9761cd587d27e38da7f528ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a link farm pointing to numerous distinct hosts, many of which appear to be disposable or compromised. The embedded JavaScript likely facilitates the redirection to these external links, which are characteristic of phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/tuxowebe.pdf In PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/1054465459.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa38235dfd7---61008883067.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/sifid.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/b237b1cca5c3deed7ec20f7b2db84b4b/61501083656.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/60f0frnrvoq9dismai0tcpqsk9/59560134180.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/12449494465.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9fe783f28---nefifugobarenedesufigu.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/fupedesuwiji.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/71525830660.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16076d88325828---86142763886.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/poropakepekulogazesax.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/23269530061.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d718bae414---wivomazizokem.pdfIn PDF document text
    • http://brune-schmuckwerk.de/ckfinder/userfiles/files/52885791574.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116d316f0d08---18121202517.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/612091beda49ba18b229cb0c7925a6cc/42431856344.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf6351420---29167476663.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/78332072194.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/legatu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae82da1a87c---zopuvoba.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/fimok.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/werupanakulimozo.pdfIn PDF document text
    • http://ore-processing.ru/d/files/84891438916.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/d737b1c53e70d74979d9f87581a7a0c4/93997031018.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/97200396378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=3rd+relationship+anniversaryPDF 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_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 18368 bytes
SHA-256: 55c86fff002ab2b05565bcc85bca1c65e10898f0e1abed706096000b76a78951
font_01_sfnt_off0001155a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 10744 bytes
SHA-256: 5eadaa6a701861a862ced7c6f220affae7881a9e763a3f9c6fbc7c10b8295bcf