Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ab357c35cbfdb4…

MALICIOUS

PDF

84.3 KB Created: 2021-10-14 13:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d08eaa22e97a3102076ca0ed55258bd4 SHA-1: 282a5fa7005622ee70ca189a88609658b765dc88 SHA-256: f8ab357c35cbfdb477bf100c866719099c0925398f4ef085a6a1a54eaa2c3d9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/27187146006.pdf In PDF document text
    • http://ptichile.cl/userfiles/file/94769904696.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/27199997189.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/venatijix.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/30730336561.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/lemapifuriluw.pdfIn PDF document text
    • https://bdata.vn/upload/files/92364459032.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20211006/file/16335016281545.pdfIn PDF document text
    • http://camwater.org/media/files/15517880263.pdfIn PDF document text
    • https://eniedu.com/data/file/20210909193735.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357b02c9a11---59121325205.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1616567e4f2d8c---xowinatedadisififixuk.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/nedokiwujulosogobasufur.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/50071424447.pdfIn PDF document text
    • https://korankertas.com/contents/files/tuvodup.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/35834613181.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/72086320848.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/3730933300.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/12f10708c45632bcb821d53d4fbbf2ff/kiwosolorinolomaxejano.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/kemeb.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/30141089428.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/16176315583.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RC0zOYPQW8A/uplcv?utm_term=conversation+pdf+to+wordPDF 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_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 17592 bytes
SHA-256: 4839a8b6ec2a3fc58645387935609066ef0844aecd88569fd4b93dd7535dd250
font_01_sfnt_off0001135d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B74 10628 bytes
SHA-256: 89434c7cdd106042174f78b70283f92d64c592ac52f2b3f7deae57e22f5a65a5