Malicious PDF — malware analysis report

Static analysis result for SHA-256 1469f63a7d8a805f…

MALICIOUS

PDF

85.6 KB Created: 2021-07-04 05:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c89472b0ed33c918c352f3874f09a500 SHA-1: 5892b3c553e01f9d54f7ef5dae0b2d4901605c74 SHA-256: 1469f63a7d8a805f7860a70eea318345bd691285cac7aaaae797bfa7458b3c95
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, which are often used to distribute malware or conduct phishing attacks. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c9edc26ca---rokelopakolawoputuxoken.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8bb3ef795d9c936c33c4ab4f56f2a032/95564553975.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/tenikulatarukizulafo.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/xajifesuk.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/bamirufozam.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ec531afb5---gelumezi.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/5370805607.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/17538995497.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/8973111416.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/fba9ced4d233f8f5b230b9f016ccd470/vobuvojefokovolubew.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/vavadoropobedusuba.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/jaxosowiv.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/pewafedukemotodoru.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/90274847012.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a78dd54e6c7340791581960957861e6/78341682996.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d1a54e32f---makovu.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/13477024117.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210619032519_5o2u9j.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aecbac5f8e---38638459706.pdfIn PDF document text
    • https://arerp.kr/data/file///55881867066.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d95719b352---94697836216.pdfIn PDF document text
    • https://xistenze.com/files/files/97037850254.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/towoxebiketu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f62346586b---77916129279.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/2inaodvf21dfm9l0ih9s4p5k5p/guxarinuzovakofodon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mr+lonely+song+akonPDF 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_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 10292 bytes
SHA-256: fdb290cd2d39e815a7b2458697fc2a8c549911ad6911bec34eb1b85f6140021e
font_01_sfnt_off0001055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6E 16344 bytes
SHA-256: 42ade781397a8b50585a3eb0a1ea6bf2aab3b17b8cd1977d98f6dc2a6942cc27

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