Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ac362cc061945e…

MALICIOUS

PDF

71.7 KB Created: 2021-10-02 21:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 57dea52b9ea71fb5f895e797dfd2b145 SHA-1: c5f4b8474d62802dc28662d2bed086ba1f8bc983 SHA-256: e8ac362cc061945e4e7d572901847ec5704a10e2bb2ee8af0ec6ba5a3e2e816a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm on disposable hosting further supports its use in malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/zijid.pdf In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16146fc1e09581---86708421758.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/pijab.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/27471911252.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/69504772324.pdfIn PDF document text
    • http://tcihk.com/userfiles/36311767235.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/zewamakepuxajenenodujuru.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/4854183144.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/pogononikupaselir.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/wawozusaferenonigiponuv.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/97060742398.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/jurijiturogakanoze.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152cd5d8e387---46277237821.pdfIn PDF document text
    • https://halead.com/uploadfile/1632427440.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/22135004140.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/538035976.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/rofumodarewegunedaloxulu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144786bc26d9---lubovaliw.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/61970303867.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/31954946691.pdfIn PDF document text
    • http://hanifeugur.com/image/files/mosoligejekagupobor.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/sonaxomodetejeditizexeg.pdfIn PDF document text
    • https://ms01bet.net/contents/files/tenatuxurefijikulotafali.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/fuxes.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/buveruzusalakowigigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=67+mustang+fastback+for+sale+near+mePDF 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_off0000b293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 11040 bytes
SHA-256: 595d1234d205abcd9b0e2aaa10b973d00ded94ca91fc183e025d79972fb8d3a7
font_02_sfnt_off0000e47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 17276 bytes
SHA-256: afb43a49d3b46e2d57e5ccce14b641b16a0d7fdafed16d647c0ce1411fdf33bb

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