Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ae3d9d1f320250…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 21:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e766c16f49ef0f87dbee46f96f79770d SHA-1: 5a85e4ffd5f4b0f2c576d1dbc0df50cf53b911e8 SHA-256: c0ae3d9d1f32025070f01f1f31a8f7da227f5d594b394899df8d4c3ef2f75170
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bandai-k.com/userfiles/file/sedefelefusufob.pdf In PDF document text
    • http://alfavit.tv/userfiles/file/91237815261.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/43qfgo8acspe6osblbn16q5qjc/90234358834.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f0ee2deb33---50861439902.pdfIn PDF document text
    • https://emmaushuis.org/pages/83056222597.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16103ff9a47042---24848703560.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/posoxikejaxaberadi.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/purisaj.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/59633693125.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/zegogirinefiseg.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9af97fb3acd0f1bfa25666014171b7f/jasafobokitagu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a149bfb7396---20354595254.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/73094087323.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/77852196763.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/3926defe1952b83aedbb35b1b96edca8.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/zugekelefuzon.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bb6768a6f11c9880ca7c1432b87e9ae1/vaxegakosilexen.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/35603748654.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/r08joikkvuodsta5d37cge3314/garazixafovunepotadiwub.pdfIn PDF document text
    • http://dyweisheng.com/uploadfile/file/2021080423180873499.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/88008977683.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/tigomategibuzurojefa.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/piwabe.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8ba3018acf07cae766059f82bab598aa/68036688327.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/kalorixijexikolivolud.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/xaluwaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=astronomy+today+eric+chaisson+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_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 16492 bytes
SHA-256: 1435f02686c36aedfb6700afc7221ae69693030076663d3f1edc2435516c9eca
font_01_sfnt_off00011e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13644 10936 bytes
SHA-256: 15d18196027b720feb4417b28885b99b9e5a9ea280416b2e1b0c64ee06bd917b

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