Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be5f76728accc9f…

MALICIOUS

PDF

96.2 KB Created: 2021-09-17 06:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b25265c0564fdb53b19e69b377761c28 SHA-1: 026a3450f42d81982351c2ace3be4d03b1c7ae73 SHA-256: 2be5f76728accc9f5493ad8f75f0b76825a5671ea98e528be8b79f567966f184
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=osu+on+mac PDF link annotation
    • http://proreferee.ru/uploads/ckfinder/files/modirepujugot.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/30288209628.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9d6aba539---90062775063.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/potamalatev.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/59979367127.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/22882303686.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/15941218583.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/fawabebesojiloketuwot.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/41313721408.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-12/20210912083807556242.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137729117459---83392433758.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/71018181994.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/47017024464.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/51628695943.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/93539079123.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/22240407862.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/roxomawi.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/66149024379.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/93411504142.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/golusel.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-2/20210902191609823875.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/zelawadukiluvava.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/23375255668.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613520e9e3ef3---putujukitijekujoxuvazix.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/ketabufamid.pdfIn PDF document text
    • http://lblussana.it/images/file/58685065576.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/39358721232.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_off0001159f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159F 18332 bytes
SHA-256: 9a5019c05d14297429830246d5fc3b3583ceeb7e415dc952ab9e565c246cd809
font_01_sfnt_off00014512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D29 10048 bytes
SHA-256: 06de0455c45a837719b1228c9c82eeeb80ddf249ac1cf318363d2a14e0bb5856

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