Malicious PDF — malware analysis report

Static analysis result for SHA-256 17adc0b7eda74bfa…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 22:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73bf8d4e6859934e7335f040041931df SHA-1: 9e1161b5574da3c991ee9227c07297272afe9cf9 SHA-256: 17adc0b7eda74bfafa9c89838525b762b708b6692d4867a7fdaeab77be042e52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns, likely initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=best+sharing+app+for+pc+and+android
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6bdc2daba---58453692762.pdf
    • https://lotusmarinevn.com/upload/files/53800094864.pdf
    • http://www.fred-robin.com/ckfinder/userfiles/files/viwifikemipelakof.pdf
    • https://12tiga.com/contents/files/kibokuwojedow.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/23770df3848cb1b067731ba766cc194a/rijexazepapinaxitobiguk.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/648f3ec4422912a2ce6cd5cd1e637a37/dukomomowanogegubovoso.pdf
    • http://prochem.vn/images/uploads/files/wakibomexoxim.pdf
    • http://anpharma.net/upload/files/kawonokujesizibiw.pdf
    • https://ystechpro.com/nbloom/fckuploads/file/jaxexigugelumozigikifo.pdf
    • http://webursitet.org/Files/file/pesuxalavuvijupo.pdf
    • http://seattledesis.com/fckeditor/file/64845569946.pdf
    • http://studiotecnicodambra.eu/userfiles/files/69935302093.pdf
    • http://www.mab-solutions.fr/upload/file/xodudonotumebaroxakofo.pdf
    • http://pushgroup.lv/userfiles/files/repubedefovapatadudufezip.pdf
    • https://candica.pl/ckfinder/userfiles/files/93419341680.pdf
    • http://jenan.com/ckfinder/userfiles/files/kozixilaxu.pdf
    • http://artattack-concerts.de/files/file/86744762544.pdf
    • https://toptenstudy.com/upload/files/BodyFile__61359073567A6.pdf
    • http://baohanhranghm.com/upload/img/files/pukebupekogarux.pdf
    • http://dietaltop.com/userfiles/files/budumawa.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161440ecb24d0c---mijuwabamar.pdf
    • http://asirakademi.com/resimler/files/zojegetanuzavuj.pdf
    • http://nordicwalkingturak.hu/_user/file/libidibabiradurevowo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e991.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 16792 bytes
font_01_sfnt_off000101a8.bin
5e863901b87fba24c4f22d68d38c2f5bf19baca29d52d5da8488c0bc9d3ef075		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 10904 bytes
font_02_sfnt_off00011aa6.bin
603b92ba9c612c28f4ad9b561061bef317512e57ee1710b2a954e2f66b20839e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 17768 bytes

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