Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a03b5af3b388f53…

MALICIOUS

PDF

109.7 KB Created: 2021-09-13 23:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 65c1109717031cfa6a62a6d4e80504da SHA-1: fddc4ff001ce71c26c896eeae428837994237cfb SHA-256: 5a03b5af3b388f537d5e8bb3a4199eb12a73e6e6cb7fa14f9a2afdd8b0cedce3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://erbaytag.com/resimler/files/lixuvogef.pdf In PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/631d3cbfee4b25c62bbaaa26f2fe789d/retafakavudaxakudatafar.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/joboda.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/vupujolujovotuvon.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/dokasizuwoditu.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/10808846930.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b0bb33fa8e22558c512816f9f6143bae/99673377648.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/rimokewezir.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/93291079627.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1c0ad7633---xunuzezimo.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/66935878012.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/siwuvolafomegitadijolexo.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/ponavodiwedujekebunivetat.pdfIn PDF document text
    • https://path.mn/userfiles/files/rozuzujadebuliresezugud.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c74999a751---12617707874.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/tetobive.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/8197261190.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/welomugo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1b5c5b98---95057209651.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bd360a9be---kotegozikuv.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///61966519948.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/69999510087.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109011410236087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ben+10+omniverse+2+game+download+apkPDF 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_off000146d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EEA 11228 bytes
SHA-256: 84237bd88879e62d0568efe2e60375de8ff605f293a904a5383581145890b988
font_02_sfnt_off00017922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17922 18276 bytes
SHA-256: 07a450bc91afde306764f2bc059a9b248f7029ac282f5bb60c30e7121269bae0

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