Malicious PDF — malware analysis report

Static analysis result for SHA-256 e692c1aa2159fd06…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 15:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3de33936079f574021e595fbfd0bb69 SHA-1: 67e1f7c298ba8788ba49eb4a54fd85f5efa7aec5 SHA-256: e692c1aa2159fd066a4bf51e5b312f4d6838a8ccbae0cd325f3eeea695b5c336
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and a link farm pointing to numerous PDF files hosted on compromised WordPress sites and disposable domains. The presence of JavaScript and the link farm structure suggest an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://taociren.com/upload/file/210905020515290752239110t3h7w4.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/s39ooe71u4t36nh3iub40hm9jc/kunut.pdfIn PDF document text
    • http://grimastone.ru/files/83345319545.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2288947526.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/kokadamofowijunilivagufa.pdfIn PDF document text
    • http://elitacasa.it/images/file/12661497848.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/taxujujevowajojuviw.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161426b91c437b---62663846092.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210916_105834.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/luwaxafidorevesemoguvi.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/naruraxek.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/zozofiwuronesugojivi.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/vodas.pdfIn PDF document text
    • http://orthodoxnews.us/file/nolalimazuxopo.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/92980398651.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/xupujosovejexek.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/modabiramudemoguzawu.pdfIn PDF document text
    • https://grouptm2.com/contents/files/zirexivaloxibuzitisov.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/niforulekuzuwopemad.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/3qvhnjmusd65qe0b1tk1hjkp0j/19701169272.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/6699739438.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613244fc929e8---52678833651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wicket+cricket+manager+mod+apk+unlimited+moneyPDF 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_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 10988 bytes
SHA-256: 52b2b987f20b38970fba82cfacb9192111d9830f439362802f49d7cb899d981a
font_02_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 18576 bytes
SHA-256: 021d36c7243dc0f79867908a6d34a4e547b62ab1c14459141570b502782b083f

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