Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29deb2ea33ee9f3…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 07:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70f09c6e6f9f41771b8f2783b639bc0c SHA-1: 331c97cf458101750f041b8b6768d01ff6cf73be SHA-256: c29deb2ea33ee9f3df280c5ed90132546fb08c3cf5513ebab343182e69a39b0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/82afcf853c93d4c388bc66b69d8ebc9c/varisoko.pdf In PDF document text
    • http://kes.org/upload/editor/files/bizaxefewinane.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/wunawelajagimatopowevopu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f583d0fac447afc6a905af4bb8770bfe/gipoxitamifesisosexi.pdfIn PDF document text
    • https://keongracun.org/contents/files/80883829193.pdfIn PDF document text
    • https://lecachet.fr/docs/files/titevifemometu.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///jiwizejofolusoviregijigu.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/besogivajuwidikal.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/99763539219.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/85193850656.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/206215647.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/rasedanozivozasomipojus.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6aab4f355955700f7262edb9e3490c9c/nisovegavumogaxokeludava.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/fokabawomojofuz.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee4a2591bc---87831280680.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/xakoxexagogusub.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c6ea27db---vujidogutigeborizadi.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/51149095502.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/44975155290.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/sanotosumiwofipot.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/wajuzazatewibiburapisiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+light+between+oceans+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_off0000d23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23B 10988 bytes
SHA-256: f2fa1ed82e3690747ddd6e29a5b77d7bbd16fece79d58bd69d5c8d48b2d30499
font_01_sfnt_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 16852 bytes
SHA-256: 7fe5b0a3195ef1d06e323787b00a85e503c6cf4eab118952c578a30b5025e0a6
font_02_sfnt_off000116de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1