Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa2d8c7722a8486…

MALICIOUS

PDF

87.5 KB Created: 2021-08-26 05:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d79505f04ac5ca2aeef416e06087844 SHA-1: 6a548565c4e721a41b41216dd7524ebc6cb74ac1 SHA-256: 8fa2d8c7722a84863f66376878dd63d95bcc85dd353bc8efced47e189589bccb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094efedb819a---dujikisa.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160774cd58574c---kabudexafuzad.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/lupuwemevaxadavop.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/janefepojefunolezedag.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/9b3nfmvdtaki135024qqbvjat8/81930370791.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/relavowabofovez.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3cqlpmbcn3vggt4456ldtk0b5g/fezisegofazujixerejib.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833521a977b---mififuke.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/25872890035.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/ferenilunite.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080dfa3d3119---51839876294.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/15c0cf537ccd355f7d1012774f58b500/94940615283.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/fogesenipusapigi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a17adf57019---bujeluwuvopix.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/xerep.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c8fcb8174296d33aa05cbb125d675470/bolupugiza.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/66832893068.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/sebozuvulesatesasur.pdfIn PDF document text
    • http://hydrem.ru/images/file/defut.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/wowotavugubudut.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/20213237064.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607279991e9b9---fojexefezamodizuxoxabul.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/94359897146.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-06-18/images/files/lejabakeluxonegusutisat.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/kugujurox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=old+tyme+charley%27sPDF 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_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 10492 bytes
SHA-256: 4e12fd371906b3f02eb6fee603af8245f4322d1ec23dea402116bc0f60d7573b
font_02_sfnt_off00011f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 17872 bytes
SHA-256: f992d7b0ef5ccaee9a71f306e6ae6caa5461d2186d8b8ebd3430c6386d5a5101