Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf7505ca62a5c2b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 00:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1464057472c23989c9e47b167cdd1b29 SHA-1: adb5e6e39f12d4e61fd20e04c50250f0078c9f9a SHA-256: bcf7505ca62a5c2bc9436d3df4ea4231e8b92155ab6046f7e1ddad78ec2fbd5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of multiple URLs pointing to compromised WordPress sites and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download server. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to evade detection through distributed, low-reputation hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161079edd33cc6---65877405390.pdf In PDF document text
    • https://semangkabiji.com/contents//files/numawubofuzovojowakase.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e219ec130e---xovizuvexudinixafirokalum.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/3kktj7vr5nkskcq5oku87nhuvf/kagapivan.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160792a3b2ef28---68163434826.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e7f1e584---tapeb.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/32150029629.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/fejuvirisobogunamadutab.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/67686479656.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/76727367567.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/fbef8691d983196e488cdf6b474dcc7c/kenaraki.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/tejuxanakivadafid.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/nutiwofuboriwo.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/pisaxo.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/8459923475.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/tuzipuwenagev.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/ziremofugoveduwofizeled.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/17756046517.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/12560670041.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/9823143ed9b7404db3d69f81d68683af/fizoxamafowanazab.pdfIn PDF document text
    • https://anjingliar.com/contents/files/vogikixiloborow.pdfIn PDF document text
    • http://erex.hu/upload/file/robivefefilupadelava.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/43504278436.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/67404326580.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160882039770ed---tisawifapeviridakese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ifigenia+in+tauride+goethe+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 10616 bytes
SHA-256: 480e3333a6ef06adf2bda36be47d83bf91eb959fb08abe6d4ad71cd3466dac41
font_01_sfnt_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 20628 bytes
SHA-256: 651f06e899fd0632a1a781dcd7a3f962396a6f733ca10a4a7a82c0054df0113d
font_02_sfnt_off00011ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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