Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bd960059ac530a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 15:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 52443b7e6325529e77a64f271eb1468e SHA-1: 4ce53240943bcd409b31af4d62c9c295eeabf1a6 SHA-256: c2bd960059ac530aa59a6ea7e9ea92791cff1a676d0c84d3354c000be11e4daf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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 http://jr.ac.th/ckfinder/userfiles/files/5349424293.pdf In PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/zebibagemewisav.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131040e37e6f.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/70914633893.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9a6a66222---vivubinupilakade.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/revetuzupidosusitid.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/zunopezoxiw.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/babepiliwugefuluteputomas.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/sexujotedafegu.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/vidopitaka.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/lidevefukamu.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/loginexemuxodonekobej.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/golefow.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/lebisuzuroxujelade.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344890999c7---40356218523.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/52681468662.pdfIn PDF document text
    • https://slotpt2.com/contents/files/niziwasopitoxon.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/weterubajojurubolegixu.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/91180207848.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/53564132402.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/dinepilojepozusuv.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/54754800119.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109071058086855.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/11064298913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=100+endgames+you+must+know+workbook+pdf+free+downloadPDF 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_off0000d710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD710 18600 bytes
SHA-256: 934e9076b2dd3cb7082de60b7a51628ba8d4a7a1a8f2c502e14e08f2eebb09a8
font_01_sfnt_off0001073d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 11360 bytes
SHA-256: 8532cd281a3a7a0ee60ee5e5e1a3aee63ef5b442fe4815c342e01127abcd3497
font_02_sfnt_off000121b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.