Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a21a83407b6cd11…

MALICIOUS

PDF

94.9 KB Created: 2021-07-05 19:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7d2936f1a1d50105ba54f3b5ac6e17bc SHA-1: 8c8f3589517e7e816068560c8522b579440c5d30 SHA-256: 9a21a83407b6cd11dd5f23278c299ea29478672907d462dc7780e998155d8e2e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm on disposable hosting further supports its use in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://polyalpan.hu/_user/file/kepajirulopofalaxazudu.pdf In PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/28b058bb80d5d390e972f98145fcb884/55287831137.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/94427743442.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbcde36c12---rozezokexunu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607327510c912---12368731997.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/3638615831.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3f06bfd29---4981305880.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/kojujiwoxugusuxoj.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/25738333085.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc396553e00---14010614795.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079a3b7199ae---xojuvotufaludimunidule.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ef3912c59---tefozi.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/87478174115.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/kodigojazatamuladove.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/msftv6i66kn3a2tabm868qev61/gefejirubewabede.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/laros.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a513cecaa5b---fobevibijenujo.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/51436032022.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/zemozupuwewodaxaguwabidi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de62434097aa832e334f381198bda9d0/16334100488.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/31768119821.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081abe9e8588---monesufesak.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2852a8d931---firevu.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a894bc0855f---5152251405.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/zijasilape.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a564df881aa---zuvibajozigedegejip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=words+containing+h+and+zPDF 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_off0001126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 10524 bytes
SHA-256: 443f559987a6da6ed3c62143a5a5fb35dcd56ebbefe5fc0514f6b7bcfd39e784
font_01_sfnt_off00012a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A26 16984 bytes
SHA-256: b28c1a3a37fc9e266197b223dfb8f80d51ad2991453b61062d95ebd62e196b02
font_02_sfnt_off00015646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1