Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b439d02edc2937…

MALICIOUS

PDF

78.2 KB Created: 2021-08-26 07:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bec6bba138c6139e24cce0a01a94c0d SHA-1: 8ebf7b0eec4700a35761201363c815495ef3ff6b SHA-256: d7b439d02edc29379efa6e682c02c693f635c0511b8a457df7123d8381e64c28
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://smilaxlabs.com/userfiles/files/viramasivukaduwip.pdf In PDF document text
    • http://seibyou-koujien.com/files/files/57236999542.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/33246686803.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/21817760098.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9e46ddba1---jixivobiv.pdfIn PDF document text
    • http://vladekoservis.ru/files/xopabogevevin.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/023d5ffc1f47ee0a29be445943dc9767/ledidefapakizavon.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/tedugu.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/zedixawoxoxarixab.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/suzuvidanorozividuzafe.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607966efe6360---87648889996.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/gajozisojosebakivejamebuv.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jlvi5ogsdtfj39qvojc3d6hhf2/pazide.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/13693223617.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210523/file/16217842092404.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/22555344518.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d553b9192b---kezerem.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/zajovotavim.pdfIn PDF document text
    • http://www.pilartangguh.com/file/bodew.pdfIn PDF document text
    • http://peoplefineart.com/assets/202108/files/20210813145754358193.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f5a3dc0fa9c1fde5e0903eed27bd4959/noxewi.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080f75c78dff---sidifumoxexilawazetajo.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210605044402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=daily+grace+inspirationsPDF 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_off0000cdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 16556 bytes
SHA-256: 93d5076b6ca347052c2743ad0ef2338f174313df179102c3f245347bd03be49f
font_02_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 10664 bytes
SHA-256: 9801bd0b9fa71d318658a632687c49fdfbebf06b64b157bf384c6c0df20fbfe5

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