Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b991e49565d2313…

MALICIOUS

PDF

75.4 KB Created: 2021-09-18 09:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f157598fc43b84452ea810c1750075e SHA-1: 5f457d8d469bc23095467b22f420d777ef5c4a8d SHA-256: 6b991e49565d2313ca8aedf9232ecc11a5c1fcf54b450507f2fff1a16f724e40
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to lead the user to a phishing or malware distribution site. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://inwebjor.ru/uplcv?utm_term=zombie+army+4+dead+war+trainer PDF link annotation
    • http://dga.gr/ILC/img/file/71781424760.pdfIn PDF document text
    • https://naves.cz/res/file/77563595577.pdfIn PDF document text
    • http://kgmda.com/upload/files/61854910027.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/tifumajev.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/lajoraken.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/dokilamituxewaruwefi.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/49945506263.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdac17d4e0---janalagukukasig.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145783d1bd41---46190460722.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/68113694104.pdfIn PDF document text
    • http://3sdent.com/upload/files/40603930782.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/25895675428.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/93af42f2162f76c6fc410026319b8353/20074621597.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/gunegame.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/koruv.pdfIn PDF document text
    • http://domario.ru/userfiles/file/juduvofumujowawijuwibufa.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6129ae32---zusawekek.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/59915419742.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905070827.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/d64a5e4bc3080d8c32a1434e7f49b0e6/tesurakosozujexiwimib.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///65413836648.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/tevelolorogadubifinorero.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/46531066276.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/virijolukasemodime.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/62401607809.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090819125463.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/roruvomesagasupimudu.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/45447259178.pdfIn PDF document text
    • 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_off0000c004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC004 18140 bytes
SHA-256: 59d0378f168b7da1b638af5265193159d175b6f9d51b367e05294a65703b1171
font_01_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 10576 bytes
SHA-256: 827b3e22598552de8804032f4e4cdc5588fcb44a5044252218debb82ce7719eb
font_02_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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