Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d795a7204fd8b3d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 01:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48ed0315e3337e7d68caa7aa5cd26d66 SHA-1: 32159a5f21e6c928036e3eee5690e7dc9c32ed09 SHA-256: 9d795a7204fd8b3d9259cc1594cc1a508ca87a949565d83705ddef41a5faf761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a malicious intent to redirect users to harmful 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://gangwontaxi.com/FileData/ckfinder/files/20210912_2BC3E8AED87B2187.pdf In PDF document text
    • http://email-database.info/userfiles/file/95556744414.pdfIn PDF document text
    • http://vinmexindia.com/uploads/69196437901.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/kapalumuzinazodabid.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/96415734340.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/l7o7mfs3v8qfgu56ju8p9me4um/nipukowatifas.pdfIn PDF document text
    • http://capableapp.com/uploads/files/pirexigo.pdfIn PDF document text
    • https://photojet.net/userfiles/file/85359932920.pdfIn PDF document text
    • http://scsychem.com/upload/files/92343249307.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e760442997---bofadirakivudaduseget.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6e4311f4e---89403317128.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/wusijitare.pdfIn PDF document text
    • https://777mto.info/contents/files/12871923091.pdfIn PDF document text
    • http://xsteelstock.com/d/files/35396219157.pdfIn PDF document text
    • http://stonebreaker.at/21107477601.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/42594077938.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/74396576744.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/79364511128.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/63921156683.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/vegojexi.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/61903856078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+worst+car+in+the+world+top+gear+watch+onlinePDF 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_off0000d335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 10844 bytes
SHA-256: 5222b557c3974a1f3041de6f3f5c21cc5695f6a852fcabd59d78de0e00f858a6
font_02_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 17672 bytes
SHA-256: 4be6328bcf717873678a19ea6de5e401a87be010b83fa09840089dbee2030510