Malicious PDF — malware analysis report

Static analysis result for SHA-256 5270593dba6598a3…

MALICIOUS

PDF

85.3 KB Created: 2021-08-06 21:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 957457dc62dccee1752821cd1fa8b697 SHA-1: 55ed3f365e44803bd6c2d43e1822f1343b52b082 SHA-256: 5270593dba6598a3fe67c31e56e8c27648976b27579a99ee9e556cfa7f6ae0d8
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised websites or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues to its purpose beyond its structure as a link collection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://proektasis.gr/admin/spaw2/uploads/files/85402084527.pdf In PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/zawisudawulotegi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a51822c227---xegolenusadavak.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c2021dbc5bb43b7d3aae2c07dc88fdd5/99862725315.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-21/20210721051328106297.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/m0oa12tstrtu7jrjvl04g25j4a/nezojetufaveg.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/19186198458.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/064b2a3dc8945aeb3a8991de5bced601/48350616438.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/88321455038.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/59351047412.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f13e00afce4059604221cb7b0b1c0c97/pigobezidaneka.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/1260323278.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/0t8ucf2rjdh3j54heijkav8v23/zuvodorezikomiwoluzupatu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609885b1424bf---musivizumawefimuwejevijeb.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3ef66ef755f6c12f417915a97c3c755c/zaletopuzizevujekape.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9d1cb7a97---65585037783.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/64977395167.pdfIn PDF document text
    • http://derma-dts.de/files/file/vabilegovexugowoxegavetux.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/wokelased.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ccvdkb27pfp40ro7k841j5ad0l/velisageremofoboseri.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/61173964788.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/muwifazimil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=module+4+quiz+answers+drivers+edPDF 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_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 16544 bytes
SHA-256: 4a9cb3e11d92f72f3b488ef31943475f98a0b9810cb4110d09f51545643c8303
font_01_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 10672 bytes
SHA-256: 67ab6a9da6ffe66081fa0a00c4e2513ddb050b5e83208e7d65a349dfeba2560f
font_02_sfnt_off00012fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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