Malicious PDF — malware analysis report

Static analysis result for SHA-256 1073e4d6b8fcd3af…

MALICIOUS

PDF

79.8 KB Created: 2021-09-23 22:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25dec0e11544cdb90805728f7d0d23a7 SHA-1: 484d3c2ccd60ee868aab35038b74de1979d54a60 SHA-256: 1073e4d6b8fcd3afc496e3af7c77169c5999a6f6a2a1a988128a96f2a333ded2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=avatar+movie+download+1080p PDF link annotation
    • http://9275522-travel.com/userfiles/file/gamobarikuxivoxow.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/wumozopo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/20cfdb2d4a016cacb938fecb6d7b863b/2274712047.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/52963131965.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/546175887614c2bde08cfc.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/50077186261.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff91769081---65012155578.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9855e3091---zorogebuteraxuli.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210911094731.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/luderi.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/dfb6f94b1bc6e39467f5032c15f8aca6/10038022912.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/44b131fefcccc922fedbdc3a37547dd7/mesiviwudunolomokalupab.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/sitiranuwotosenodutoj.pdfIn PDF document text
    • https://asiapharma.la/files/files/24185482312.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210902033319.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/roluf.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/3852567643.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/gebosabepefi.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/pesusapufepotetebujokedus.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0686bbf9f12b28df2a50b02bee55aa85/baponemurelumok.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/gibaduvagizasis.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_off0000d418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD418 10900 bytes
SHA-256: 48008737a98d87da802c1d6e5fc5e2c4487cf8639da63bb36b250027767a89df
font_01_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 17156 bytes
SHA-256: 45909fc592f3e1d17dd2e23978aea66c1fca6b081a0679f71de0e9bae3a03377
font_02_sfnt_off000119db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1