Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6288c0de5810f09…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 16:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2c270d1f532cdcfdd5f7d3a561e4da6 SHA-1: a6c321a3e5b22d091e485d37a7b3bc9ca904949d SHA-256: e6288c0de5810f09d5d8f5c149ef4cdb06ab31c0910cdc73926b40c323825c0b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised CMS uploads. This suggests a multi-stage attack where the initial PDF serves as a lure to download further malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f00b2e523---45205277099.pdf In PDF document text
    • https://agrilaui.com/userfiles/file/magagelunop.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/nabiz.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/duvugofigumobo.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a46949d76be---mapajir.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/04b67c6721f4433cb6112fd1e69522c1/zedof.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/91085322047.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/70609177151.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2f7e3e15a67ba26d2b7c336a639f60ff/zezobodib.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109010230457318.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/33608384711.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/tiv2lc15g3d9uev8bfdcfrj8b4/vovinibafeludag.pdfIn PDF document text
    • https://inncredel.com/uploads/xovowe.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794388b25df---tegefabedonulituwekex.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/72768546269.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/96242284895.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/sebojijesakosodokuwiba.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/sidukaw.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a9858787a897e8b261ab03e3cfc96745/lavesasojibufobigamumo.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/dexig.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/21905027735.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073d96716c70---jeteveveferusofeg.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/nexobikavunujuzevizawuvek.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/13398158971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cheat+for+word+collectPDF 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_off0000dbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 17700 bytes
SHA-256: 455b3047a6ebaad6cd92e26089ce39f462216808aabeeaacd4a3d314b80a1ace
font_01_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 10328 bytes
SHA-256: 894fae3e75a1ea4b474c7f71532375a769598b3bc2310affaea0be79e0227274
font_02_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1