Malicious PDF — malware analysis report

Static analysis result for SHA-256 433fede576fd07eb…

MALICIOUS

PDF

85.4 KB Created: 2021-09-15 18:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f05d0ee7acdeb9aa6746073fe87b75cf SHA-1: 6d9a9513409eee199b02b52cbaa92581cbc3e0e9 SHA-256: 433fede576fd07ebc8dade4b0789fb9024d75ec34ef709c1956219db9f99b579
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://krisoc.ru/uplcv?utm_term=how+to+control+your+phone+from+your+laptop PDF link annotation
    • http://cn-noah.com/uploadfile/file/juzulumu.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/46412334303.pdfIn PDF document text
    • https://limsurdua.com/contents/files/zadipulubituna.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/56426066426.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/72011078920.pdfIn PDF document text
    • https://suncables.co/images/file/83217397137.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/warupemux.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e8e38de0---teratipomapilaj.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/11954488407.pdfIn PDF document text
    • http://i-physiology.ru/upload/lukinanetetegefaxevoxo.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/todaje.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff212555db---tatipeluxikagupekisupuda.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/fixewewijen.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/sumujevesowekar.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/zegiz.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cce4a6fa6---fazuwigujugegapobodixodof.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/nexazofaj.pdfIn PDF document text
    • http://ipublicity.cz/data/file/4274611637.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/kudapox.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/tr094mds4qvm5g1m1tlplmg0c1/legudewekove.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/nutunuxuzebebez.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/87245439142.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/34987358480.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/gubumukom.pdfIn PDF document text
    • 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_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 10776 bytes
SHA-256: 7777e2dfa44d93db397c9fcc9fd748d70b55fad4c502f4aad21e59ca4d992007
font_01_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 18588 bytes
SHA-256: b46e9a236adc8b5f1845083e3c7cf524afaf1d8a63a45a616e62ee22fb2c5f6d

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