Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c76e362c1df5842…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 02:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1a9a0ae6d6e37ca5fc4ee606d7f2241c SHA-1: c4775aa875cc0e99b1c2c9dc20588cb400941688 SHA-256: 3c76e362c1df58425e75b558c260a5c79ea8b50ff7707b7e3cee298ffb4e00d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting. The primary function appears to be redirecting users to other PDF files hosted on various domains, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ntpuvoice.com/ckfinder/userfiles/files/74299251547.pdf In PDF document text
    • http://stellarp.com/userfiles/files/kokibirodonixitugemigugor.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/10937727898.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/babeletopumavuvemofir.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d5ec24c6e980509dd540b19c75721d54/xilobonibovetivinibapaw.pdfIn PDF document text
    • https://wineart.online/userfiles/file/nemigawebowurozubejod.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/87051724879.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161365b532cdcf---kusexowajila.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613923493434a---faworotabolapuxozi.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/97976020633.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/38344157172.pdfIn PDF document text
    • https://lordoptika.hu/files/files/93807210399.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/wajel.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/polaxulotagolifurexexujor.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/sapasipatipupupesaxuw.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/sekefutibaxozimok.pdfIn PDF document text
    • https://kaparatt.com/images/File/siwewatag.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/nawadura.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/95190241037.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/508518350.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210906061528388.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/53738295563.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/pakikalelofubaxex.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/8794939221.pdfIn PDF document text
    • https://raljob.com/userfiles/file/dowobibumifuguvu.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/gozedogojafitometuton.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=watch+venom+online+free+123moviesPDF 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_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 11004 bytes
SHA-256: b185058d3c56787ba575a61021416725ffa408a2406fa6811b9c1ab12913cafe
font_01_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645
font_02_sfnt_off000124fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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