Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ea1108a2fc2985…

MALICIOUS

PDF

83.0 KB Created: 2021-08-16 02:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c22ca51ff3e98bc2fcdcaa262508093f SHA-1: 63ff430ed31de09c480ab16de69c219da4e77413 SHA-256: 71ea1108a2fc2985120c4785e61c25af3c974ed48c0eb8c311ae452280f79feb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the structure suggests it acts as a redirector, potentially to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bestpokeya.com/uploads/files/jizopokasepifizedekaki.pdf In PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/11b3c6a7c927e5a3ddceb24d5f3c64ce/12489253189.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fdc6aea45---39933806479.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/gutisabibisodu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160846fd014f9d---soxomaneru.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/muvogerisexom.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16104d15eb2139---66778856590.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bbe0e4e15---wowojasoto.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/bubemomemubamax.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5dea388e---butadojazow.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f605d86102---68133512445.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/a5be0ee9a777019d9370c28834028c71/widatosiwodetusago.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/43947132159.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8e5cda3694d7a581d1bd751ee3d881ca/barusenivujogazaten.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae266a6deac---jagonirowugugotix.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/36715146947.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/vuvovekupune.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/84728604365.pdfIn PDF document text
    • https://lasanisports.com/files/72690184843.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/dukitos.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/mumipamokebixes.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/98765473197.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9cc227ff---majemunapixoxopezawo.pdfIn PDF document text
    • http://naturallymine-chicago.com/clients/867610/File/gekapulikibivizareg.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bf17ee3db---xanotasitigev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=strongs+exhaustive+concordance+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_off0000dedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 11196 bytes
SHA-256: fee2dee4770da39edcad37a57265180e802aff4be91b1f922459fa5430e50332
font_02_sfnt_off000110f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 17404 bytes
SHA-256: 883d7d0a1b7e9b9890b6ff949d098d25df007a71afe39703ec45354b739e3065