Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36be10713700720…

MALICIOUS

PDF

86.9 KB Created: 2021-09-16 07:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ab20e98170936cbe47087341c329db4 SHA-1: 66e045db5a5005bc1d0ee1699bacddd5d6095c46 SHA-256: c36be10713700720158af4c35bff5c0584a2f240fa542166a108e19bc943d8fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://northcoteplaza.com/userfiles/file/tulagarubupepopufax.pdf In PDF document text
    • http://cornucopiafrederick.com/uploads/files/zubado.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/nisako.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/nitavuli.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/4703706539.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/30141971808.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/lofijidubolufesof.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/90675585806.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33a77ff82---budeginesameb.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/mivasoleg.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/85744193517.pdfIn PDF document text
    • http://esistore.com/userfiles/file/riwunegewegaseninexikexo.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/6434677250.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/29443556405.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/zisokamewumifefepotojejez.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/88724729701.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/fm8ij9tucqa2vfnv1sua3quef0/34415029738.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/tujufataxifefim.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140901d59aac---29578681342.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/goduzugitasifewubeve.pdfIn PDF document text
    • https://baglab.pl/galeria/file/66853959309.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/6572062747.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8dd9d937deb48355565322c19b4d3276/54732488411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=my+onn+tablet+will+not+turn+onPDF 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_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 10364 bytes
SHA-256: 006e1b91f384bb191863fefc7c946d81bacdbcfceda72de2b6fa77852fba5040
font_01_sfnt_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12071 17712 bytes
SHA-256: 531eeec25a948886cbde9f21dd8a04f1e23f43311c9c47fac5dbb58144d3df5d

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