Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc73502a8cac286f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 11:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d0de6efb630a394a4bc99e8bd75e544 SHA-1: f013b00be7de9c4e374bbec15003be2098b5f77b SHA-256: bc73502a8cac286fc47cbf5e5a4633f7325f810df86ea08a2415e0aba41c196d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS upload directories. This suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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://selidbe-beograd.info/files/44709373044.pdf In PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/2063960665.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/larabuwokedifuwiratagugil.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/10166187683.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/43297208082.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/siwidisifowopu.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/jujugibomorimiriwosotun.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/xufanemigibazabepujo.pdfIn PDF document text
    • http://precisao.org/files/files/folorarab.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/44356988758.pdfIn PDF document text
    • http://travellerisland.com/files/75076437687.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/82518048747.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/60705582364.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/xadufekino.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/vapevakuliroridede.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415173dfe4a---xejov.pdfIn PDF document text
    • http://marketingnews.fr/images/file/gilizanusujow.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/darulovefojibulibelidinu.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/13200644477.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/rafibe.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/66369894609.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132612225e57---motigedozivajogibo.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/kefakesokodikituxu.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/86569340961.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/21f206b76675c7052b60e53ac6fb32e1/75173450498.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/nevejisobomirod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+emulator+small+sizePDF 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_off0000ccad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 10552 bytes
SHA-256: e397c0e13570b105f768ea536386afc72a4518db1f8768789dbaec8c28feaea5
font_01_sfnt_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 17520 bytes
SHA-256: 830079177c6e6ec2e607e7c12f3b8b33470c3266080b6616a3f0a11a3533448b
font_02_sfnt_off0001127e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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