Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb95436094fbc463…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 07:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a6db124765c4a8be412069ad3d3fa56 SHA-1: 8a09caed7e1d4b1b3eb783b98e37648cb0207bc9 SHA-256: bb95436094fbc463530b6ab9ca25a570c6d611acafa7e1ae65070763a2c11eaf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of embedded URLs and the overall structure strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/6095276792.pdf In PDF document text
    • https://hamzakocakoglu.com/userfiles/file/18077013629.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/97691344946.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a64116b71---fenetasagivudidedaseji.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/rigasarijebagulijezak.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/parefotejuji.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/mevesubimogofosozepoda.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/radar.pdfIn PDF document text
    • http://fitviewer.de/files/file/41593745361.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/50431757116.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/poliki.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/80535931633.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce80547ac4---zapepawutujitevinutuxalip.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/zepisikuxe.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/makodasuwulawon.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/maxitagego.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/27221365405.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd94223258---porafugesuxesimosewomofe.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4b9efe42---11353241700.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/17344610690.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/95626104814.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/xavugisojisuxavepo.pdfIn PDF document text
    • https://wsbtitan.com/images/file/69521650398.pdfIn PDF document text
    • http://compsult.net/userfiles/file/nijinedezudaludazuzakiz.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/tafozafetejuduv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=live+cricket+t20+odi+apkPDF 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_off0000b2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E0 10548 bytes
SHA-256: 6f9b64b8f6df1c41cd77893cc24e96c08251d791f5d184d9a8f569b298bc62a9
font_01_sfnt_off0000cb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB19 14388 bytes
SHA-256: 9e27dc5fa47b8bd3d337de27fe65fbb1cf69a8a8530cb28829976937e1cf6919
font_02_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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