Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5eb41bfa6da7d07…

MALICIOUS

PDF

89.1 KB Created: 2021-09-09 00:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ae7cb9a6d1e3b4af5f40a1472032dfc3 SHA-1: a4a5ca185aefc2a0efd2f7b2cd30fab79ce18746 SHA-256: a5eb41bfa6da7d07281abacb0d85b9730a834b63a0967661a8f17070eee1a62b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS upload directories or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://ankurgroups.com/userfiles/file/19630699732.pdf In PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/tozotunakugawidum.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/21769518009.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3c2e165a46cf0162c67ac2154ce9eec8/87665905725.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/48445903125.pdfIn PDF document text
    • http://chpcentre.com/files/file/49472457237.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/91906607026.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/52689579399.pdfIn PDF document text
    • http://zl369.net/userfiles/file/vomofawon.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161327d172529d---78067740989.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/tegolo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1400030dd---11430236559.pdfIn PDF document text
    • http://herbexindia.com/ckfinder/userfiles/files/92236788659.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/163057775994.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/4556803293.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/10549281946.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/20380046824.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/letuxiterutolipabemidi.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210908023704.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/72570302034.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/31608653720.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210901234824.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/zujadiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=watch+roohi+full+movie+onlinePDF 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_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C2 10592 bytes
SHA-256: f64a6aff63294ebd0457670214cf3a1cb9045216238cc9c8d2d3719e412bd2c3
font_02_sfnt_off000128c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C4 17788 bytes
SHA-256: 5b7cb34bd372ea1142079e4e43271b0d7b8d9c791fb95da0ab227992a10241be

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