Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1b07daaef8fdad…

MALICIOUS

PDF

86.7 KB Created: 2021-09-08 22:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d89bdd27f9d2d41f9b4fba0e0e32fda SHA-1: f638554f829d7f63d44f9bdbead3da904eb8b757 SHA-256: 4a1b07daaef8fdadcd89fcf4e3f7c70d88c22520a0fe374f4f72cbf75fb9497d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware or facilitate phishing. The presence of multiple external URIs and link farm heuristics indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ntep2008.com/UserFiles/File/nakabusukarutedojafifev.pdf
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/kanedaditilomoda.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/61147619396.pdf
    • http://baloneacessorios.com/_upload/file///22002533764.pdf
    • http://doremimarlikinsaat.com/userfiles/file/woranewazufofozopibugefa.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/gb046h3d6otrvlc822pljchsvu/tuzapujuramusegurukow.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xajilibozibimiluwom.pdf
    • https://warungmimpishio2.com/contents/files/bivusenixisina.pdf
    • https://soalmatematik.com/userfiles/file/80831695680.pdf
    • http://bluebiz.kr/userData/board/file/78001862130.pdf
    • http://knipia.com/userfiles/file/xukeseje.pdf
    • http://telegid.tv/userfiles/files/motozexakuwireziro.pdf
    • https://asi-filter.pl/files/file/87096028992.pdf
    • http://ahchala.com/img/file/wajiguvexo.pdf
    • https://dampinggame.com/calisma2/files/uploads/letije.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130a8e9cab3b---zaxurejowesizafupixu.pdf
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/fitolikesefum.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138aab1c926f---52837712049.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382e7aceb0c---sozonekufawefekis.pdf
    • http://hichipper.com/hichipper/uploadfile/file/2021090308075173499.pdf
    • https://kibledergisi.net/resimler/files/11775478564.pdf
    • https://bi-kiesabbau.de/cmsimple/images/file/binekejezilagiweke.pdf
    • https://chinese-wall.tw/upload/files/90052105366.pdf
    • http://wpscrm.in/uploaded_files/userfiles/files/limunevidodegino.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=xanathar%27s+guide+to+everything+5e+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c3.bin
0bcf3a1e0d5895eef8fbb30f15f926b807101474e7aa06fb44e407593c0dbb8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 11316 bytes
font_01_sfnt_off0001013c.bin
92911388e91eeded89598453ac674191a3c187b2626ac0e1a35d995372862410
pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 19224 bytes
font_02_sfnt_off00013438.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13438 16792 bytes