Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d4825524fe08a1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 09:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51e419c6121f8dba763bda1b183dfa61 SHA-1: 7fc2414dd3f77d29ecdb2ae12d17d40b3ad73029 SHA-256: 20d4825524fe08a1c5c7f8c97f44d5d4b3dde0bd5d6d9588aa3f1be587e5e254
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://beerskiboot.de/img/upload/file/tazedidir.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c97b865890---65990891996.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/nenubenada.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6de5693d2---24368733611.pdfIn PDF document text
    • http://espwireless.net/uploads/file/35821749116.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/94953944115.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/10803085382.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/vusagawut.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/34148321341.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/13139763929.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/mozasovizaxasazovatamab.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/migabemijor.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/xeguxubak.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614299067ff7c---88253456709.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/14591079485.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/4b43f686e11aaddde0ddcc1931c480ce/mozabujuvof.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/51719535122.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/matiguxinigexelim.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/92616362209.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/60515223128.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/37768229851.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/gujakino.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/beguwakosadesavizu.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/vavaxelovinebukijiji.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/moxadelolemivef.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/winokawo.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/gisinuku.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/woletegoxogotakunuwefofof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=transfer+purchases+from+iphone+to+macPDF 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_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 10760 bytes
SHA-256: 582fbf50638fc1b655c3b36f031413f77bb7505f864ec3468478c5d3370366e7
font_01_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 17472 bytes
SHA-256: edf92d4e4c81be32f2a580ccd1e81fd73eed07f62daeb871640f1de3999299cd
font_02_sfnt_off000120da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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