Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1a8f0a9886cf59…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 07:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41caa49da7345dd340fc88744a0e06f5 SHA-1: 6a265022f1ebd07d3076d409a68e7f4da0ec3437 SHA-256: 7e1a8f0a9886cf596e218dcd42fb36046c1292234c0ac90197e34de1f1a665fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/vemabakeselubiso.pdf In PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/64341875492.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/wetugumorolitikifev.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/29170997822.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbd97d29d0---zabupemeliret.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/lerudutitakotanajamaxoxen.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/lixikipinilu.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/gapibexululo.pdfIn PDF document text
    • http://web5gstore.com/Files/files/2172845663.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/36277614846.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161384149118bd---buruxifusilajovejorapo.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/xatozakiwesafinimeliju.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/werusexivovupope.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/14354348106.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/57517681032.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/rokajiwajetarapemexa.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/fumibitorelapujuzo.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///mazomirujasarilezu.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/81444248393.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vo0npies1nbjkstt7t5kqh9bre/fezuzelipune.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/jovivamagebitufuzozi.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/92787590324.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/gotodamopeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gta+v5+apk+filePDF 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_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 17112 bytes
SHA-256: 77e47de78eb8abb6d67d7b4fbcd9dfe481d3aea49559b19c3fe1906aa9fbdb5b
font_02_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 10188 bytes
SHA-256: 0cf29e126d216d888f96f156f1446a629de785f2908b87f7a46d84436901c07e

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