Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe24e929a9ac5b37…

MALICIOUS

PDF

93.9 KB Created: 2021-09-09 11:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c28b018cf3b512cd2009ff546e498d6b SHA-1: 3e48aeff7b40e923b04d4262e2e159960b12d59f SHA-256: fe24e929a9ac5b37fce0bd75cb043ec949a4dce188ba994b9367b2097c7f77e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest the PDF is used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://cructi.ru/uplcv?utm_term=how+do+i+find+hidden+photos+on+my+android PDF link annotation
    • http://balaton.varosom.hu/userfiles/files/76517153123.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/vujazemokij.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/dolalezatefotebizolazob.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/tajusatanutujunoruvipifan.pdfIn PDF document text
    • https://network-italia.it/file/23180930466.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/bawiranidoguwepe.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/vavira.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f96f4e92c0---18494556650.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/pevorinuvezagod.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/43fc07beb63ed34a985e4849cf7af38b/85531781072.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613432c7839d0---10003032387.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130431073c2e---zabuneroripegirexelusab.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/33009302385.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/94701018012.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/77939848986.pdfIn PDF document text
    • http://fxmeat.com/upload/file/350c5c1d683426a07f53c1d80a68e988.pdfIn PDF document text
    • https://robodom.si/files_vsebine/46645405459.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/fifugakep.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/peguzujalisofegivi.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/48036655343.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/pozafukabetagujas.pdfIn PDF document text
    • https://miet.hu/kepek/56101741368.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/31894356594.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/pinosozavejexeboruzutaf.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373c4c512f3---zenojekametoraxogu.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/72065243257.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_off00010469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 19968 bytes
SHA-256: eb64a48d0cb4e8d4fa98239b21bfb5d5318b0b694d32793a0c36bb68e0f54f85
font_01_sfnt_off00013854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13854 10908 bytes
SHA-256: 5b04efcd0677efc40e4100a01fbf82b5215a5ea18b47ec1ead31a492a55238b7
font_02_sfnt_off00015167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1