Malicious PDF — malware analysis report

Static analysis result for SHA-256 949345e084de7802…

MALICIOUS

PDF

79.5 KB Created: 2021-09-09 01:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94f37a752d0b6bb54a1bb0c36b74b724 SHA-1: f57db909a611edb8846cc0a5ad16ddd1350d8dab SHA-256: 949345e084de7802c307e72b6f3623d52d5003ad54b8b0898e377534d5afbcc6
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or are hosted on disposable domains, forming a link farm. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, contributing to the overall phishing and malware delivery objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=how+to+convert+instagram+videos+to+mp3 PDF link annotation
    • https://iaido-iaijutsu.ru/userfiles_exc/duzamazivu.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/jaxorodovap.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/8538319237.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wemop.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210909050400.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/78339822571.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/repafosigoza.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/94439098108.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/46594180790.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090710474492.pdfIn PDF document text
    • http://askort.pl/Upload/file/47322052770.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/72608569805.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/dawigedusefusisapole.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/walevubasiw.pdfIn PDF document text
    • http://gzwep.com/img/file/202191205919.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/povaluvolukulinijubolaf.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca0bc8c92---disigabudujuremavama.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/12454057931.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/51417164890.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/84923237247.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b72e1be7---fonumanaxusomu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/031967d04b324e601b69bba6a18b165e/74582684756.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/70665828982.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_off0000d3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BD 11124 bytes
SHA-256: fe82d14934c1f0c8e474f98411f17ed7d5a010ff0ee6f0c42b6e8f80b4c80fa3
font_01_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 16664 bytes
SHA-256: c4a9ce88212737b85db8d59db1501dd7f7dd9dff156c3ab1c56ee7b09ebfe5e9
font_02_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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