Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba0cbf341f978fc…

MALICIOUS

PDF

85.6 KB Created: 2021-08-24 12:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9638368256e4ac66e5521dd6ad3fa9de SHA-1: c413a0c2edbd13523729a98039ed2e01fe6a20d6 SHA-256: eba0cbf341f978fc5c1b035e461b5ecfb5da1a8b7b3de7c756da1559a6667207
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised or disposable domains, 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 malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://smenergy.kr/uploaded/file/4507909616113f1fe53fc7.pdf In PDF document text
    • http://jngf.cn/files/file/memamujapazufalakabug.pdfIn PDF document text
    • http://xzass.org/ckfinder/userfiles/files/magimazo.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/fojulazigekobomureno.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/pezotogidozab.pdfIn PDF document text
    • http://billsky.ee/files/file/57183511113.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d91e23db8---tumozovuw.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/jajinikupi.pdfIn PDF document text
    • http://01host.ru/userfiles/files/vigojovuxazuromej.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/92707602739.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/85761016472.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/75568329848.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bb65092ce4---31792573958.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/rorefekugaje.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/86957741708.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/nexuzazuxexaro.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/mumutekumusi.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/183cc84db1c226ee151592a93610fd1e/12994392816.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/22f262ad042320f09c91d012882e71f5/38876976996.pdfIn PDF document text
    • http://whatdwellswithin.com/file/41179696608.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/srh1unr114ag53f1vtl0ifpvs0/padokafisefesosir.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/24d47b7fcd01c582ef27be3d831c53d6/lekelukivol.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c57945cdd7a---xifopolixagozavatuselof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=yellow+skin+on+fingersPDF 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_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 17484 bytes
SHA-256: bf150b4bdf76d94265f7f7fd83feb58f053b9500c0815407151c63cdb93ab1c0
font_01_sfnt_off00011824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001303b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303B 10292 bytes
SHA-256: 48c563eb32c1d1140a34bec701d68434bd1f1a7cc88067d3f0d7591d1dc494da

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