Malicious PDF — malware analysis report

Static analysis result for SHA-256 807a3342e8abd9a5…

MALICIOUS

PDF

73.4 KB Created: 2021-09-26 19:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4ee501238d79f9831124369283f8f54 SHA-1: 297fc8caf235a418ee8d94f2630a411862fdd32d SHA-256: 807a3342e8abd9a5c34f5bfeed453622ff8126501c22e941a1ac29dd562965f7
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 CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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 https://huntic.ru/uplcv?utm_term=border+copy+paste PDF link annotation
    • https://capitalsyndic.com/userfiles/file/76526028080.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/64738764804.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/xepanexorokixuregi.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210908105809.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497a044fa41---zosikosavizafo.pdfIn PDF document text
    • https://hoongnau.com/upload/files/vejegez.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/jozumiduwapopaz.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/lakabitodolazawubozojonan.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/539c1fa998fde2bd2eee80ac0e6f4ce6/71472612692.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/31284619610.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/80015557097.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/viserazisagarozeb.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/xinatedabinim.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2e70cee63---47890634608.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/88545013606.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/71870661562.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/zejekenaduvakisuzezorisom.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/25946369852.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/68310277860.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fazikezabepanas.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/96144435438.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/19339983100.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/mamawerolop.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/14262303108.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/jonewulibugivapovoz.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/73902809161.pdfIn PDF document text
    • 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://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_off0000ba9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AC 18496 bytes
SHA-256: d6658a26836f487bfa19f898cd1eacd6fe53703ebba73903307fdaf28cbfc6f1
font_02_sfnt_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 10432 bytes
SHA-256: da1ce5c1f84104d9d09102daf742e13193d5d44942e36badaee685de561e0c07

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