Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a731047c91ae9e9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 04:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58b3bbba34f54d15c6a75d01592430ac SHA-1: 2f105be289ed05175a31806bb4f839426d69dc30 SHA-256: 8a731047c91ae9e9180fa755e9a634b985fc964773bbb65759cf5f57c152e9a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for potentially malicious purposes, such as phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=es+file+explorer+share+files+with+pc PDF link annotation
    • http://thevalleytrader.com/files/nenazazunemureburod.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413598e0285---toritibanize.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/79300254846.pdfIn PDF document text
    • http://sentralperdana.com/file/85006770852.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/zajidigobobepodada.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/11111954532.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1da37eb3b---lasukibabiloloxudexit.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/44571729846.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210915222146.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/88679131586.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/zebiduvojogarugajo.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/lurutesisuzubuwujuzikem.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/78847250506.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/kaxowuz.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/15406034807.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/38067f4d2d26dbc2386a651604eab837/13301992574.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca2b6759a6---tuderepa.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/3964734825.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad35b69d8---27504665910.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/95636626872.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161433eeb6ed46---tebisurekezujis.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_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 10644 bytes
SHA-256: 3adcf895b8adf3f1ec88cdc49375817a963ce1e06ea56bc0dcaa439d78f78247
font_02_sfnt_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 20084 bytes
SHA-256: 1d649d82add9a58bf7ccde3ed049f53a2ee179634346d90334860d46423fb201

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