Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aede657baa9dc8e…

MALICIOUS

PDF

139.8 KB Created: 2021-08-18 18:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4842ea383c2605ef53ec498e46acac2e SHA-1: 35bcaeba3d8f09b3ea811e878c9cebd1bf19a87b SHA-256: 9aede657baa9dc8ed02064702a26819188b8ec93bfacc6d4a83510b978137f66
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on various domains, many of which appear to be disposable or compromised. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The structure suggests a link farm designed to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://antifftech.com/uploadfile/file///2021051621564856.pdf In PDF document text
    • https://yar-net.ru/userfiles/file/4645067835.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/86589052523.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/loterukagumanamiterub.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/2086127976.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/60190966477.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/xirijisaxu.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5a268e64d---nunonafujatobabixeruw.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796d947a98a---13147305604.pdfIn PDF document text
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/45189190333.pdfIn PDF document text
    • https://bak.vn/upload/files/6169424488.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2502e5cc4---68950860003.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/lakinokuxugiwusi.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/42347314701.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/99432938392.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/pisukipegawerira.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/wedumujemololokifirude.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/kujelapejebuten.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/8752865647.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/minekajalelepi.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/9032754655.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/3119968393.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0a6fa12c62fede3c317384d0c43a697f/farawemonumivuxoge.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795d8641511---tagufitusagukorubudopum.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55ed6872ef---boxaxagitigix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=nombre+de+los+tri%C3%A1ngulos+por+la+medida+de+sus+ladosPDF 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_off0001b05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B05C 23332 bytes
SHA-256: fcf2b9801cfd4e75e4e40b5b8a21ac78023671a3471e857c3a1dbeebb34875b3
font_01_sfnt_off0001ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2054A 11132 bytes
SHA-256: 9021a9c7062d7d32b107d3a75a898d1e4fdec1d65b5e3de6feacee5012993631