Malicious PDF — malware analysis report

Static analysis result for SHA-256 7622449d3124c0c8…

MALICIOUS

PDF

95.7 KB Created: 2021-09-01 07:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e91d26a07e699aaae43891494a7c887c SHA-1: f4dc8c7e50f968187193d603db87eb8073ab1804 SHA-256: 7622449d3124c0c8942798049e4f8182e7c6639cd1745a795bcb7e327d78622e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to external resources. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b1a91169b---kajejunigerefiboxu.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1r98sgejmus4b92lcmmvaptej2/61091856318.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/32f6e7e67156b15db17dee9e31b570f8/14145853713.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/68967700604.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/duzimerogidogomagabik.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/23842374248.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/79446053111.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/wubakijusu.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/fidorulewis.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607748ba76a91---65201375922.pdfIn PDF document text
    • http://nature-revive.org/files/file/manegijipelutat.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/zipunuveromi.pdfIn PDF document text
    • http://sbkf.org/files/files/35687384401.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/6577405553.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/naloxowufopi.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/zirojani.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7fbaac073---21381081148.pdfIn PDF document text
    • http://surtek.biz/image/files/20150224_072811.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/55095104014.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/57688408600.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/d9926bb178f98dfb5e9c9af912881a7b/15400099315.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/42399395277.pdfIn PDF document text
    • http://altinay-law.com/images/file/859845546.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1fae769dd---sanowuramo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=homemade+calligraphy+inkPDF 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_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 17732 bytes
SHA-256: 69e5f7a4ef276d2258483652f06f7057d5171144d4bd1cd9ace7d1e105183adf
font_01_sfnt_off00013f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15755 10892 bytes
SHA-256: 429d330461f391f84ff8a5455d6ce112c656687bc336de0c44dc19db54f8085c