Malicious PDF — malware analysis report

Static analysis result for SHA-256 987f02027796944f…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 08:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9091752852f229805f7c427c3b45cc1 SHA-1: b7c5e9975f25e7398a44f323500837f506d656ea SHA-256: 987f02027796944f1f198bd5db8a47fd804db584fc757345a21f8e1c313c4236
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crewmak.ru/uplcv?utm_term=tunnelbear+unlimited+apk PDF link annotation
    • https://livredart.com/ckfinder/userfiles/files/xujuvaxizituje.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/kadugejogulezatutedug.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/65191440421.pdfIn PDF document text
    • http://cosyromania.com/media/file/tasuwuwefu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135c19f9a47f---waworavatejuboki.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/mubepede.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece3c6e58e---86446826705.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/zokug.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/99167399936.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/borojonibuvomuxaw.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/556452542.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/duvixazejukipoku.pdfIn PDF document text
    • https://123natura.com/stockages/files/82243443777.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/78219098956.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/korafigave.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/421011123.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/lagerovirifuvonixo.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/nosipodezo.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/nejugido.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161357ea49f7b2---68051426592.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210903070323.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/51408055178.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/tejiruneda.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/66611063478.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_off0000bf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 10560 bytes
SHA-256: ade53b794a3f7b0f4fb96347982646ecf8a5d15fc3e64c6d7ebdfd042d4f76e8
font_02_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 16104 bytes
SHA-256: 8e195b8a119eb1f5197f108e48fd04383a4187e28f5d4faec1ef7885994a6a2d

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