Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bda839869eb5266…

MALICIOUS

PDF

94.2 KB Created: 2021-08-06 00:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9836f1db5d74c4446257e2565d09b24f SHA-1: a0017db2bfa7693355ba7deba18f82fca965b4da SHA-256: 1bda839869eb5266a7a2f8600d8ba012f3f0ec3f9177269b733646eea9e68910
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://3colorjazz.com/fckeditor/userfiles/image/23831283028.pdf
    • https://info-jimukyoku.jp/lot/upload/files/vawifilob.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e820da18b---torovegize.pdf
    • http://motorlustor.net/userfiles/file/nitenemivedujizuregawok.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160947a6c96eb9---25803481555.pdf
    • https://obermeyer-modemarkt.de/upload/file/38570070139.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a95feda32---50146877800.pdf
    • https://angkaganjil.com/contents//files/vefawewunilixo.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd39c0a5c3---35632965426.pdf
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/11421449670.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160af78928d2d8---60486975001.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/saqv0rofmge5oeb4hclfm6gnbk/9014335822.pdf
    • http://bosch-service-center.ru/uploads/files/61379103286.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c244c45d---91694073150.pdf
    • http://didopack.com/files/xavadesiterepowizuzirova.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a0205bb8e4f---zobuzipeziparolewiwaz.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7h09siida8iafphu2kmcm0ar69/raxuwixapazimufanepib.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecb137d599---wupipesu.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/97360f82eca7b8014b622f6bb581f4e5/repixa.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/1tpo551qq4ofsv1oj8p5577l0m/pisufon.pdf
    • http://podiummoda.ru/userfiles/file/22033552030.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba769ecb96---40271366444.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=must+can+may+exercises+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010400.bin
cbce67558f3e379750b8277511987d0184c17436d75a21e52c8c2ef3cd03bf1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10400 10924 bytes
font_01_sfnt_off00011d5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5F 16792 bytes
font_02_sfnt_off00013571.bin
a613d7876c6354c1ff31033190f256c4caa79e42e08cb11de196b51c4e61b47d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13571 20012 bytes