Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0a633b08887e32…

MALICIOUS

PDF

88.6 KB Created: 2021-06-30 13:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 12c5167cf6a9161256c3057a14852c98 SHA-1: 8eb0bbc2f3a37f3b1710ea115348f2e4006a86da SHA-256: 6e0a633b08887e327df6841fc596f88c3c9a42ea7f24fc63fa4a8858cc7cc10d
96 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites, many of which appear to be hosted on disposable domains. The ML classifier strongly indicated maliciousness, and the heuristics identified it as a link farm on compromised CMS uploads. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 5

  • 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.
  • 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://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3a8f98967---9829115656.pdf In PDF document text
    • http://nickels.design/ckfinder/userfiles/files/23411734971.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/38930780447.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/2d68b72c75f91f35cb8c2237f07d6fe1/radezatowifusamizez.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/87129592977.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/namilorimusavaloguzufure.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a77ea118a---bokitejupa.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69beca5313---zukijanixexitidagaso.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b770d11812f---76633626266.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608308910b2c3---904054224.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ebcbbaf8---vokagoporugeda.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf934629d01---50437495233.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f97a73c9---47023152234.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/847f0038944ed8808a4422cfeedab715/82548154697.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/adc7807b634b635b1be5d4bfa25ec845/53894800082.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/xijekimalu.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/1605432370.pdfIn PDF document text
    • http://khochailo.com/upload/ck/files/4285134656.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/15815465251.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/149fb34686313b11a49659e1933f63af/9097176487.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/55390038653.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32eae1a573---47401104813.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9c9e5491fc76f6771fa75f758a3496ee/wupepav.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/99970696423.pdfIn PDF document text
    • http://hogan1973.com/clients/d/d4/d4eda5e2427b34f3a15374adde9a77da/File/44051084336.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/vigagodasalojebov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=most+to+least+compatible+with+aquariusPDF 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_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 11000 bytes
SHA-256: adc4ab43c55630cccc4ce66e44651c161e294331a494bd20e91025e21e748c8f
font_01_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 16116 bytes
SHA-256: 2fecf9d4e8c01b03988f1cb8a734d397ff2972fe6ddb1af6b8647b3ea2043d1c
font_02_sfnt_off00013ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1