Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39bb91c667de583…

MALICIOUS

PDF

83.8 KB Created: 2021-07-04 20:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6f21bb516fcfa51da671544e1cc65fc5 SHA-1: b722158970e5410211a50b96c82f6521692617c4 SHA-256: c39bb91c667de5831feff85af9643263e111ee78933d8d4b06464351f7f21d3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://boxethai38.com/upload/file/35854469250.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/eb8c635c1bb13c20dceed58825d70c91/valapidofej.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a3394576831c99429fc13382e5e88efc/29494411735.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928695b8301---57667349556.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/fd544cab5ca35da3d61ba02747a5ffa1/40479978976.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0d3e1e65c---78443544780.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/8086a6400d1026278a96aae5aada4c1e/nilewegagod.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/raj9qomqia2nr02ongt9cqh415/11914450081.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/fadewa.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/gananebi.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/mezanibogujananefa.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89dd3c7de---vajaz.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/gorosobogawebefi.pdfIn PDF document text
    • http://fygl.net/uploads/file/192125304759.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa5aa7d44---zasanivomojovajowisez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfa1f7658e---23827788035.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/nufitikivibaradapebirul.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/68226333421.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/najuxagipebuse.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc8b82f844---5414931514.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160883c70423ae---99587789821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+quote+a+website+apaPDF 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_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 10460 bytes
SHA-256: cfcc6a98145c45c1c3a25dec70b6bf3132902a96c38aa7d2020ab21df3e3adcb
font_02_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 17052 bytes
SHA-256: 1d7d0a1f68e625631f268cee3d62f1f8e9bdb04b9b34109c8828b29251699d1f

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