Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b3cb37c2f9f801…

MALICIOUS

PDF

84.5 KB Created: 2021-09-14 02:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60a6a825c8e7555f956eac76059af5fc SHA-1: e4c7899c2eb3e75fa74244414f2eb0b56e06de07 SHA-256: 54b3cb37c2f9f801ad65e9bf95ed2d39a3bcbc76b94b71ec72cb8c2f38029a4e
172 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further payloads or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4325

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://pistant.ru/uplcv?utm_term=forge+of+empires+ios+hack PDF link annotation
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/21515892058.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613500ee3e6c0---33068055199.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/nemebebagimanubu.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/fipegivonemer.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/dajadeb.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c56888759fb396977c5331fe13d259f6/86306783334.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/manog.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/litorejogoratem.pdfIn PDF document text
    • http://csp.hu/editor_up/fafijukusifinenatijotufi.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/86064384770.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/dafajuxopuvofimarunobos.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/96981097146.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/bazuninukav.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/22054394120.pdfIn PDF document text
    • http://househouse.it/userfiles/files/lumuboxaduvazofavereve.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/71240797550.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/95922322937.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/sinijogupixisexoko.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/raridadamabisobojufosar.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/10390161539.pdfIn PDF document text
    • https://pixel.bg/img/file/sunetujov.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bee161aa9d---39240632213.pdfIn PDF document text
    • http://asja.ua/userfiles/file/18851087750.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/eb88ae0d878e2a47088f60dcf3a290ba/78390089432.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ef07.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEF07 18132 bytes
SHA-256: ce28e1772f405b9cf07525d8ef18639cf1e81c514daf435df7e95d70c13c52d1
font_00_sfnt_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 18856 bytes
SHA-256: 4ae5f77431d3af3905ee045790565b211582850e6f7f6e36d368a46192aab2a5
font_03_sfnt_off00013c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C84 10748 bytes
SHA-256: ff69c35d223de45fa6e61cdc64ee5591ec05dda47caeff7e82c7df4e73676f8f

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