Malicious PDF — malware analysis report

Static analysis result for SHA-256 9487296714bb0d11…

MALICIOUS

PDF

82.5 KB Created: 2021-09-23 15:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22a7c7dbbe7366a19be5c44840ba9bb1 SHA-1: 323f91bdf0ab5687663e93da81d9ff727d61eac4 SHA-256: 9487296714bb0d115cf96f543a461efe26d42ff25971e1b3ab6428d93087dfb5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of embedded JavaScript points to T1059.007, and the nature of the document suggests it was likely delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=call+of+duty+mobile+season+5+apk+download PDF link annotation
    • http://balalajka.nu/media/vopif.pdfIn PDF document text
    • http://iltorg.ru/upload/file/xelasubinukagajuti.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/21405535239.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/37116806720.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/bibujisofamutepusozoroz.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/adc5152c3f4fb0306cc1b9b8e752509d/viwelaleguzut.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/77361835001.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/50097604045.pdfIn PDF document text
    • http://packamate.com/userfiles/bugusazewid.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/dotixunalizowixutijope.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/10f69759e996d6c89c94019344ef7bbc/74731380331.pdfIn PDF document text
    • http://exosushi.com/uploads/files/27629493031.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/69763146120.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/44099738011.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/21887299284.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/68313525847.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/banudezijabobokirosikade.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/biwemavojemiti.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/94322901153.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/75717168426.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a83aa4fa94---50249770365.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/35564083066.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_off0000d4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 11256 bytes
SHA-256: 35764b47e60a0f8d55b63e4aabfcd11c09ce685673b6110117f20ce38134a0bf
font_01_sfnt_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 21032 bytes
SHA-256: e382182f501fda9a0e4acd9a3c3ffcb5870bd4a7872a9fd4fc4dae1a1fa2d7f8

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