Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fb8cccce6cfcf9…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 03:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 69f7cef1ca4d7d98949af616a4689ceb SHA-1: 4b89e9fb2c75370e2b6dc2666990352d156e7b11 SHA-256: 91fb8cccce6cfcf9388ece6a22ae1d611e855d3a19ea8c9906450db53f438e58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=new+real+book+pdf PDF link annotation
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdd219d5ce---getafa.pdfIn PDF document text
    • https://christianschoch.ch/userfiles/file/rolesefeme.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210919_0DC37C752449A86B.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/42472284450.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/sitevimabaleramalomepena.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/dixena.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/14532605886.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/mukuzerupijegagemuzibini.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/cb341ec66f1ffeb6849352caa6aeee33/25676561846.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/dagv5rfeei3g7pdgrn9mkeost8/dawomufirizemujesomafi.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/nalimu.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/42792913571.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/bugotopaxigufabesofovexox.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/dufine.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/soxefagozuxevugonaveziwe.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/45846317146.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/96138592585.pdfIn PDF document text
    • http://synowka.pl/galeria/file/38264472431.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/lozaniberurani.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f211b7e80df0e39ad1863fb93ae1c16b/96502700247.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/7748728002.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/tinisatirelof.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/xenoletexulu.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/77152118949.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161408c74f419c---vazelurivigetatunadune.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/24206183796.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_off0000b4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F9 10324 bytes
SHA-256: e97b4209863ce49036550d2b82fea8e6871ba6656a43711e235d0fcbaabbdd01
font_01_sfnt_off0000cc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 16120 bytes
SHA-256: 5bb79fd636d14700b72ace8c6b47ab210a7f2bbddf72f2e66956dd1ad41ce230

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