Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a8f7fa7e99d011…

MALICIOUS

PDF

85.8 KB Created: 2021-09-15 12:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d49c3ce23c4467d56e165734651d8679 SHA-1: 21cf9ab5651e53b0a31e5d3d7f866483bee057a3 SHA-256: 05a8f7fa7e99d011ebde78bad94f33dd40bd8deede8b863a324a159ba4af82dd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to compromised websites, suggesting an attempt to distribute malware or phish users. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/da65cd0678893404095a6602348e8bbd/872240561.pdf In PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-12/20210912224845971186.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/25065848789.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/xesijumiv.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/lemojabepipawazap.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/juxoguvuluzazo.pdfIn PDF document text
    • http://profstil.az/userfiles/file/68941370602.pdfIn PDF document text
    • http://synphabase.ch/upload/file/julakitowel.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/98151610056.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/10635266972.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f7326718---25657730683.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/vuwinodiw.pdfIn PDF document text
    • https://wittnebel.dk/file/sunoxom.pdfIn PDF document text
    • http://land89.com/ckupload/files/37493437991.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guwumafawasutolako.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109080125125005.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/delemageronedowozewedaj.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/15496910520.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/14c2a3b7f2bf621be8b7f5d0b79c363a/zufifovajiv.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/12563462652.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210915_150035.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/75307110668.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/bijuvagukiviresafufelovuk.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/ripexulirevudefo.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/xunonesipaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=spider+man+2+offline+game+downloadPDF 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_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 17604 bytes
SHA-256: 1c43434f71c42e119c3a58385047942591b983a67c25ad460038c1c3b5d3a331
font_02_sfnt_off000130a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A1 10856 bytes
SHA-256: 08f609e341e21e810547a148db907e57fc69675bf4804b0a0b54aed4eccd7ccb