Malicious PDF — malware analysis report

Static analysis result for SHA-256 051a31b1542defe9…

MALICIOUS

PDF

71.3 KB Created: 2021-10-02 19:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 437b9637afbbc5b903a7d349e9ddff08 SHA-1: 952f4b13e56fc21fcb463fdfee7955c66b6ba5b0 SHA-256: 051a31b1542defe9d7167e436ddc496b0aed03eac04f10092fbffbedf6b2a2bd
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 related to phishing or malware delivery. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://china-spec.ru/userfiles/file/tikumidomulujunuwajumazof.pdf In PDF document text
    • https://clubselect.ro/ckfinder/userfiles/files/35477533296.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/jepepenanonazino.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/rubin.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-3/20210903103344909285.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/kikasowavebodilifupafafuw.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/pafowadegadizepiri.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/pemikadinovub.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16147c11c641c9---64470029945.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/maxuwosuzibat.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/9920909066.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/norovunojojupulunuxebi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614804c318a05---luvukabe.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/55329781587.pdfIn PDF document text
    • http://silver1979.com/upload/file/furulesolamopon.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/70304690539.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/xebatutirasakagowefiwop.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/mumulegem.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/50243390739.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429b39d99a9---fajitokujuxukekijex.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/fifezegazibagi.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/16875130144.pdfIn PDF document text
    • https://guijek.com/userfiles/file/54827325297.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/67952056285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=airline+operations+pdfPDF 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_off0000b58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58F 16596 bytes
SHA-256: 60515b2c0c55c2aff4807c6635da41dc507af034cdf97eca9e0b950f325ca303
font_01_sfnt_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 10472 bytes
SHA-256: c160b992264bf61ca3a7cc4f30e28b4dc1cc6fee18735eadf2665dd5175a0094
font_02_sfnt_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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