Malicious PDF — malware analysis report

Static analysis result for SHA-256 4411313d60d55c68…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 15:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7b75b9925c8c681a6a4632dda48587d SHA-1: d4558f829b42ac60a35a8687f4a46891a7741918 SHA-256: 4411313d60d55c6893904afaa75a7152b031aca57b3d664607bc4369014b330e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. These links form a link farm, a common technique to obscure malicious destinations or engage in SEO poisoning. The ML classifier strongly indicates maliciousness, supporting the interpretation that this PDF is designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zhjpharm.com/upload/files/deputavuzuwa.pdf In PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/gogifijatipugikoj.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/92361423707.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/30afc3c33ebcc20043958ed3961325cb/sisalewawevixozamugise.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/72893890278.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/kopajubigututijefamerup.pdfIn PDF document text
    • http://rinsacars.com/files/others/tulekit.pdfIn PDF document text
    • http://fxmeat.com/upload/file/b0c4bc7b491554d35caac5640ee9b142.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/depunexefifatomegavej.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/dexor.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/rawofona.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/10565439756.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109012257262856.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/78900820796.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138877e22d8a---9792829857.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qjfoaeomnacm1vb6b7jl5uq6uo/73561492849.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/54390368065.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/noludosevaximenilerej.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/17084752880.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/jeborerakobejoluxub.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/23641722675.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210908_2D0BF505425AEEEF.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/45557704734.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/kinosaxekawavokafani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=systematic+sampling+worksheet+pdfPDF 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_off0000da99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 17212 bytes
SHA-256: 546c1eb502d5c5a1f4157c02d955a545b4dc25c9f0d10fa808e581a2b600fe7d
font_01_sfnt_off00010730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 11436 bytes
SHA-256: fa8939e666544d003dcae9318087f4be9d35517548471fd6b4fb3f7f77e89ffe
font_02_sfnt_off000121dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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