Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1115c42c7c3aef1…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 05:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b50acb43b94bc3e44fd0ec969bd505c5 SHA-1: d165d3845bed35c70e21a09840bc0f40ce4cfd56 SHA-256: a1115c42c7c3aef1bec5dc31ea4f256a0dc1c9fafe556c6cd35848aa1823001a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript may be used to further obfuscate the malicious redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=origin+vandal+valorant PDF link annotation
    • http://tradeweb.es/userfiles/file/70284300958.pdfIn PDF document text
    • http://honda-vo.com/upload/file/xadofotilopazusixuputa.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/livapevokagijekekarebar.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/noziwivoribojix.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/79698027385.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/06c54bbfda22d98623cd8cd04eb63e41/ronux.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/zarodomegiwimejub.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/55682494140.pdfIn PDF document text
    • https://wildnaturetravel.com/File/95829153725.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/18032897477.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad804b92c2---sozagumulume.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613825c377882---70466795258.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/23116450686.pdfIn PDF document text
    • https://haidangpc.com/contents/files/98178881925.pdfIn PDF document text
    • https://okazionche.com/files/kuxexanuxufakoxoko.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/91411559390.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/jedupegatopen.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/tabojulimejerof.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/xukeromunejutilomo.pdfIn PDF document text
    • http://nfc.soo.jp/file/nufebema.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/72724292595.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/zozot.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/diwugegalirijoxep.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_off0000ae65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE65 17400 bytes
SHA-256: 26539370c4512868742265cd679b84536a4433a3524407b1913479524b08a23e
font_01_sfnt_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 10212 bytes
SHA-256: b22e311981c700f4996c17c19545bd3e442f2278b89f69b2c93c20d46b76bbc1
font_02_sfnt_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1