Malicious PDF — malware analysis report

Static analysis result for SHA-256 313df809d27773d2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 17:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48030199c185da8c3bc84af1d9dacbb7 SHA-1: 90cc31d6f9b21b0570e5b9ee1d26a995b3a5957a SHA-256: 313df809d27773d293835107ba860abdadbb69075774213bb95e00c50840c63d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous potentially compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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://kingbakerypans.com/userfiles/file/gebiguvivominadalidodojog.pdf In PDF document text
    • http://aa-nusd.jp/17529511370.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7i9ungan9623fc7nl4pfoca9l1/79812716092.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/25487388096.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/32163101130.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/jisinewagiraninos.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/76221735155.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6430c0e60---toboxuzobowupini.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912439ec56---fegotusupijul.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/vudaxakokaxadifidolejit.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f1a520b2---ledukowotabulelatagof.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/26788748657.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/61503883619.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/xelikawivejifogekesa.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/volaxurebako.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zititarefomuzemubunivolux.pdfIn PDF document text
    • http://3m18.com/images/editor/files/nokekarudusidixus.pdfIn PDF document text
    • http://bubb.cn/up_file/file/naxukaworebapuderogidotos.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///57005501652.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161363e6419203---sifokubezibikasibopemof.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/15726308617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=system+recovery+options+androidPDF 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_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 10884 bytes
SHA-256: d4aaf70ea9de12ca2fc75cd465848d54dede85697ee066162152b42d40bcbf5e
font_01_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11019 17752 bytes
SHA-256: cea7d3d35921dfd8f4471637e122435d51d95faf43234cc038549cd9f5d58513