Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f779b5af12a6b09…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 03:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2adb0270ed04e957de96b887e4db4d12 SHA-1: af44ffc413216f46fe12a812e83544632d45ee43 SHA-256: 9f779b5af12a6b096413938c9488508f64dbdeef8fca7ce435b8953c36d4c240
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm pointing to multiple websites, some of which are hosted on compromised CMS uploads. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect the user to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://gtshotel.it/images/file/69809733838.pdf In PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/debituzalenolix.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/zelivolilededipuvumutige.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160762fd3c0359---2763214091.pdfIn PDF document text
    • https://baongochoa.com/upload/file/90825308194.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/76911523564.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/a2de2e5eba338abe6a305e20564e9ead/46303077353.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7830091e9c---35875950240.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac98d928d69---resafopabilobetez.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210601073634114.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dc2613a3d66621cb0129434f59a8a223/5040860296.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/rejevixefapudaj.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2d1ab2af80af5b1aca58bcc34da86cb0/55304193171.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poleba.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/42ee3371511b85710c8f4a6d2a2b61e2/65019214712.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e580a61ea---77716449296.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202108261250484278.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/27736829083.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/84ff2da70a36aa6a26c56dc161629233/84078613798.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/1855532400.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/33727719425.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/jimoruvudubofasononis.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/wovudol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=40+year+old+still+living+with+parentsPDF 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_off0000d18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18B 11040 bytes
SHA-256: 1a4469ad303afebfbdd06a0fb8ea2104d6fcb2ab5befd15cf8bdb025a51cdc25
font_01_sfnt_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 17192 bytes
SHA-256: 6da3bfd7dc89e09974efa2be855937bdcbf8fa6c74fd87ea9fae6a6621c0f1fe
font_02_sfnt_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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