Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ee41ac52130476…

MALICIOUS

PDF

79.2 KB Created: 2021-09-21 09:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4884bc53b8414ccd50a454c740bde088 SHA-1: 3f2c5d36e747ad37decb7ceb3a1e50acb16f9000 SHA-256: 68ee41ac52130476e43f1e4b7618fab23df09ee0c8b029b0d8707728ce16c7c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe2ae0102f---janeped.pdf In PDF document text
    • http://studiozammuner.eu/userfiles/files/60480239019.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/wovajisudinofotuluxusel.pdfIn PDF document text
    • http://kes.org/upload/editor/files/xotobugamavawadenit.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/20651992137.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/wasolol.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ea7daf7e32cae0e56652d11e1ea1bb14/99209469820.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/27r045i07mf4qc522cd1n5jo72/10691306021.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/7646083678.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/felasejadigoxanojovapuvo.pdfIn PDF document text
    • http://szwygs.com/upload/86918720053.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/86924179523.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/83254635938.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/jaduvasudesikexaxawebipi.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/mafuradetonowes.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/20984461127.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/7621138822.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/7830364503.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/22229496503.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/7419077786.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/48172398151.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130317e490f7---26214259362.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/58091681291.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72854028340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pro+c%23+8+pdfPDF 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_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 9424 bytes
SHA-256: 12f38148f887c030de86357e6ec4b0d10ae5849bde5a6ace7fdd6afe2b9166d8
font_01_sfnt_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 17188 bytes
SHA-256: 51f0b14c8f4d644489a411206ec1062496c294a93c0d0f2e71ecf602f7872604
font_02_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1