Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bab5f18828afc4…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 21:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f6236123437edb68de89b40eb93cd960 SHA-1: fc9ed685af70a1a351744e0c8a470fe3689a4e08 SHA-256: 45bab5f18828afc48967b232dd63ddf17ce379e7e19efd0a37ac20e6fa17c43a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting or compromised CMS upload storage, indicating a phishing or scam lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=free+fire+voice+changer+app PDF link annotation
    • https://krainaogrodow.eu/zdjecia/fck/file/70264753736.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210905_872F64EFF65A2E8C.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/kukezupubovivikuz.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/xikakokopewibete.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/bofebebumuk.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/29583881167.pdfIn PDF document text
    • http://intertribo.sk/files/laxulovomowesokag.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/9463738860.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/xitawodurefasulawokofov.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d1fd4019239a460585bb3eda99962e34/88627205003.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xidamerolevusajozego.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/pamusadevup.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210909091039.pdfIn PDF document text
    • http://lj-group.cn/upload/files/rumimasif.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130abab5dcee---merezavawa.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/82892346146.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/polilo.pdfIn PDF document text
    • https://panoramabyty.cz/content/76466994862.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/dilosenukujo.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/niripanunilupixitupaguli.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614007a722948---70937997479.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/sumizijujejipogetoleru.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 17552 bytes
SHA-256: b596904ad7730ee844c94ad52ea644adcc85fc5f729cebc6ac3d2f023fadcf37

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