Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb009e55ef015113…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 09:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5702b4fedc85a060b2a26a01ca2978ed SHA-1: a3c09a7040f1184d434ec31792d1e18a5b80cad1 SHA-256: bb009e55ef01511360538d3aaae072750792e9508fbb4c9bae2962455d606a10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://crewmak.ru/uplcv?utm_term=android+games+not+available+on+play+store PDF link annotation
    • http://tagsu.com/attachments/fckattachments/file/88815639760.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/vumobit.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/davusuji.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/071653453503.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/jikuza.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/nujodadekiralafubijib.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614441c07824c---lulojefedit.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/zotujipurilo.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66578702292.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/podozevegilolajagula.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210919030217.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/73a0bf031deaa8882e2e949439764578/66997879975.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/97997785352.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuvomevasomogonodurux.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ic2g30eu1qjagmvao18s0nk7ep/69411645667.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/16113559.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/vumuf.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/50977158945.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/nuwikane.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/jozutom.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/25609838149.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae5b83aad---2616372451.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/53047832613.pdfIn PDF document text
    • 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_off0000e394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 11036 bytes
SHA-256: 1eb9898bf8b49bd9ef6a79a2bdb954741ec4b3f6cbd124e35b16fd22c2408eb0
font_01_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 17916 bytes
SHA-256: 7d01b12727c1b177d458bf18150a079b7ed7350b31bcf684f99ca6333175d809
font_02_sfnt_off00012aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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