Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc7c9a4f7e59f21…

MALICIOUS

PDF

94.5 KB Created: 2021-08-15 01:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3f8d67f55e0814af900cd9c28a4aec78 SHA-1: 4cd15deec9db5df56c1eace63433615d72909a9c SHA-256: afc7c9a4f7e59f21139362e97c97b2588e1be10530f8cbf808695cbcf07157f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm or phishing lure. The embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3d4082a03939453b810d2b5bae7fc02d/1881425816.pdf In PDF document text
    • https://blnk.eu/userfiles/files/ginufeg.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/totjmjcdesoi08onij2g3bd1al/48311400984.pdfIn PDF document text
    • http://matras-devison.com/upload/file/75421429172.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083349c8de1c---14947732802.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/29961465329.pdfIn PDF document text
    • http://rapet.hu/files/46673122772.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/buxodunuwu.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/tofor.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a71429cae---fenulepuwewuxugadimixa.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075c75772ef1---mutik.pdfIn PDF document text
    • https://podimercrm.com/img/files/96571882173.pdfIn PDF document text
    • http://caramelitos.sk/files/98333203858.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/j3avn493vifgpb18qn126voish/996036754.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/3226b583765306ce30d7f57832fc466b/xamugefu.pdfIn PDF document text
    • http://azizolace.cz/images/file/gafurejaxiketuketugula.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a893b1b9a8e---sazodikizereratu.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/51260504103.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/4baf3912cbef8cc29e0a6f131984c0a1/xetuluwaza.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4a3ae367---29068091237.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/ramefawof.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160770159d12d1---vekemuk.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610448691643c---26385819162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=solucionario+libro+historia+del+mundo+contempor%C3%A1neo+1+bachillerato+anaya+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 19500 bytes
SHA-256: 204b4deaac14d914ef2270fb6cdc4b21636cb730df2108eb188199347a3c8de9
font_01_sfnt_off0001258d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 11544 bytes
SHA-256: 09879f951a8700caeddb568ce4f686e9f845180bf5c042be4b9614c9b53f8ef7
font_02_sfnt_off00014025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14025 3724 bytes
SHA-256: c23091545100602cf4ae1ae6044a1ab9957a654113507c0787940c9f9e71fd1b
font_03_sfnt_off00014e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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