Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fa7eb0bd72dbfa…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 16:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1734daa2543155cb4a73974c381e77a4 SHA-1: 2986488916be6c3f4b145c240d08c9a251bd56d9 SHA-256: e2fa7eb0bd72dbfa284369c016f1d0658d25ef60ccd9e9606649feef525a69da
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=finite+arithmetic+sequence+calculator PDF link annotation
    • http://yushendesign.com/images_fck/file/1631603980.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b28bbe6d322019fad1633509e9e846d8/lipavitug.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/jukobiforizuk.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d0a60e1733549458fd8b71fc79e6dbd0/saveminitozexoki.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/9160245052.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/57501899620.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/19172080071.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/jevedogijo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/smoddeuqcl07ep1rm5ul3rf861/riveselexofiliduxe.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/ruton.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0230331399930e395f15ed24a8f79aed/91660383408.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/lopaj.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/zisijobaxuwem.pdfIn PDF document text
    • http://terrietanaka.com/library/files/norubasunamidinizid.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/tutilizoxin.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7tgik3khi9acchjrpo3tftk93l/83512926569.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/30289469220.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/zuxaforobexagabowemapi.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090751821_858030028.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad2e069b7---jikexabikitigave.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/61281229679.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/seripalulotivezuzevotobin.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/remogimuwonofebasasipukak.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_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 10716 bytes
SHA-256: a71c0477be94a505c37ad9203f8bb2f34ba97f52416a5b6bc5f95255eac952dd
font_02_sfnt_off00010787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 18248 bytes
SHA-256: 1f3584b2a32a9272112b997c041ede399139a076a12437d737d2a154ea300593

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