Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccc3401cfd6e64a…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 06:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7fa963a9e5735e3df71a9a6d0748624c SHA-1: 5177c02d208da934524cc58361c5a77ac8127221 SHA-256: 3ccc3401cfd6e64aabf8051c5cc8003522d12234932338c64a441bb9b23b5666
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests it's designed to redirect users through a series of links, potentially for malicious purposes such as phishing or malware distribution. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pikhospital.com/ck_uploads/uploads/files/21350910364.pdf In PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/11281719089.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6f380590518686471e73647273411380/56659137233.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/51426468230.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/36176991763.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/f22g1itlpgnvgmjc57p2ee53ng/rafovegogufomukijebijag.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ef4540ae---wevub.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/zerijakuwatapujesodi.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/movetogakexekawixomobug.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56941538091.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/iugjs5an8sfajcrugss1bovql1/88486564690.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160afae80250ac---madarekowupadakivuvi.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d403b705cc---50995164310.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fce1486c1e5---wijiparijajefizel.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4c4c3200505869cb637d56f07bd071ad/pexemabivu.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/13475296795.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/zesizimitufopopojiro.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/80147458807.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/golixazagaj.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/0cd9e660e4c4179e5aef1c86d1eb6b37/50913963992.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/61ea6fc09336016f82a5a1403e533d3d/kezejadadavanelu.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/88633491155.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/31771448751.pdfIn PDF document text
    • https://equinox-e.com/upload/files/24083527599.pdfIn PDF document text
    • http://fairview66.org/clients/866114/File/zuwivikov.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/bexatunolavijuzawo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16119df178cbfb---53906913371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ehat+is+blue+ballsPDF 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_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 10104 bytes
SHA-256: 84f92805bd41eefb94c49e1ba43adfcbdf6a0de354b7a884318e4158089f034d
font_01_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 17648 bytes
SHA-256: 8732fcde49491e935c67999132fb82b6552df8c7b3b6d7b21c944adb3c67e27c
font_02_sfnt_off000135a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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