Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0d6b3297bf80063…

MALICIOUS

PDF

84.3 KB Created: 2021-08-17 07:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d56c3925acb338a2ae12543c21dfb3bc SHA-1: 900c3b920384b8af73a5b2b5c173331d5e074a37 SHA-256: d0d6b3297bf8006323e76fd23f34cb082b88f9b47bddfb4f78892bb18eeafb3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs suggest an attempt to manipulate search engine results or lure users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://jszl-rolls.com/filespath/files/20210817113018.pdf In PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/fezuxer.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/watof.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160815612b743f---jefewedaforavak.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/ragoguk.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/feletunosumuge.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/10720105083.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ri6jv6guuusukj1o0v3sc40aj5/pisobesinoputigukedon.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/2c45e320c2b2bec36d87848aa2cafcee/78335427326.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/jaxazobajelogabijusa.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mh26k3h7lt675iqm53720h3ds1/88092633313.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b494f59e90---90516114130.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/jedibibekugejulujape.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160783becd3d26---motutezelen.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b81681b76f3---94012104169.pdfIn PDF document text
    • https://termoformat.md/img/files/48978315933.pdfIn PDF document text
    • http://guitarenko.fr/img/files/656412017.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/42750275481.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/11510283810.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210709_1B0322D51181F1CB.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/80249740673.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/kexunigivodofemevomofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=resident+evil+zero+strategy+guide+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_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 11060 bytes
SHA-256: cf64f079503c97ccaff579a2dfb9f1c7ed67f58e754b9c880796ec8f883f2c0a
font_02_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 17120 bytes
SHA-256: 1dfed2e78cb8c402244b59d824233f89b7919d5888f826897ffc965d449fda31