Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3e774324e59fe2…

MALICIOUS

PDF

73.5 KB Created: 2021-09-09 11:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6143197ec48a2796ee68ed53ebdfac43 SHA-1: a6a33ca5269ab7c9fb74ff8337e9db60e4055dc4 SHA-256: 1d3e774324e59fe22b5176663fd56e4aab0751a4bc73559de72360f37151aaa1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. The presence of external URIs and link farms indicates an attempt to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=download+smart+iptv+apk+on+firestick PDF link annotation
    • https://giolog.biz/images/bulk_images/files/16964342143.pdfIn PDF document text
    • https://campermagazine.tv/public/file/61005008901.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/tutigutus.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/gojuluvefajezag.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/sovepijufino.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/45849984706.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/79f69867364e71918bdbc508ba11b27f/xemetubuniwomaduli.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/98074211575.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/fopimonerepu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d157e8bbc9d000ad267ab1f46ff0a773/24210300369.pdfIn PDF document text
    • http://citty.org/images/uploads/file/88748429303.pdfIn PDF document text
    • http://surestegc.org/documentos/file/xelonezatiwoma.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/ranamolorapud.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/63572316592.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/94494450772.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/40974112926.pdfIn PDF document text
    • https://maviet.vn/upload/files/lamifosisine.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/kabixifubow.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa19b700c---rofemikobib.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/geruramolugelibazuroruxiw.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/vawanolut.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/nijogufebimemodefiva.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/wezedowarusa.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ji1tbdaq457pq33csldk1j9gv7/zebuja.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_off0000bb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB91 11028 bytes
SHA-256: 247ec6fbfc634fe5963e1b49ca4e0bdd16dc0f24525df1b1a5f00fdbfba6d9bc
font_01_sfnt_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 16852 bytes
SHA-256: 40ccbff060932baa370e5ca88af3ced414c5676e5180c7b5348d8fbc9101e704
font_02_sfnt_off0001009c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1