Malicious PDF — malware analysis report

Static analysis result for SHA-256 f970d62540d38971…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 12:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 724c399bd4cd1dc7f0128534c36c2717 SHA-1: 7cfca8a7549f767ae3b2eea45c3299d8a851babe SHA-256: f970d62540d389714f25d6ba2527868bfe1c97ad0babdc52d528566a61a8466a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=5th+class+social+science+book PDF link annotation
    • http://crystaltrade.hu/data/file/zexivixalesolevojabaxe.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/11498759772.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/48388556184.pdfIn PDF document text
    • https://maturana.cl/upload/file/pipavekojad.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/siligano.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/wizusuraburetawofexarex.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/dumejubidipuvemikovosopu.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/29676861265.pdfIn PDF document text
    • https://jobtiara.com/files/files/roderekefewefalisa.pdfIn PDF document text
    • https://majubesar.org/contents/files/jotuwileruxaletunare.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/7839479092.pdfIn PDF document text
    • http://olympusflights.com/files/files/97366025424.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/pilisas.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210904103634.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bc53ec1d5b2267eabbcd271dd5c7ea85/80328371312.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffaedf2fee---1332184607.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0f2460ede---69479610038.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131a6086d2ba---10297858680.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/soxedavinefeb.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/fezupape.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/87868647982.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/nutarivagaza.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/rexadawoseru.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/juzolifisanofujexezotixef.pdfIn PDF document text
    • https://ratoempat.com/contents/files/zamazezinozowulogofit.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/wekowimasesukolalaz.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_off0000cead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAD 16932 bytes
SHA-256: 26a64cc6aec33a7f870b1000f4232be72e11f2dbcf4650d521d680f6835bed21
font_01_sfnt_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 10496 bytes
SHA-256: e2f141e37f9337dc8b96470e68965e589e8d00624091e7bc0b2b766ce85b6ba5
font_02_sfnt_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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