Malicious PDF — malware analysis report

Static analysis result for SHA-256 efef5bd68ae5f1d4…

MALICIOUS

PDF

86.7 KB Created: 2021-07-23 06:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 27d1c3f4f2f372103a7508739624e580 SHA-1: 1f170d1cec78d48c53ccf55e0184304064db43e4 SHA-256: efef5bd68ae5f1d49bc3ffbfe0dab4e823ab24b91e6c22a7fec1e0c5d5f3a9d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • 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://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/8abd61daa3b596740cb1da5e4357bec9/bowuvar.pdf In PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/53863365900.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/95696070265.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/00ca61741eab107983fdfca8678ffd91/20659708961.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/sevefigizevefoluv.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/2728448706.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/98174181597.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609baad6bbf3f---15681392919.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0a9d38c1---gemoga.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16092a60b266a5---30557419509.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b17ad345f8---97586309407.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/wepedirugu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160899b70985c4---zataluge.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3479e75f7e---52061168917.pdfIn PDF document text
    • http://blueyee.com/upload/file/090826057915.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/53054241088.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607786b5d5206---meduxibaga.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/jomumetomajeruno.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4fc5e1de4---nodogitisuxetofazip.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e8bec52c2---xuvikoxu.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/ec6fce61239ffe214d77406ecdf93c23/94051250167.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/14033065035.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6f852ee82e---jozirupagazebajiloxakuboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=set+me+off+meaningPDF 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_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 17680 bytes
SHA-256: 75e5373c49644fdfa334539bb79a9b276c1ba5c52713030467ceebedf1a32f75
font_02_sfnt_off0001352b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352B 10320 bytes
SHA-256: f93942ba9ea6a7fb1bdbf771e3bc608020fa7830b051afa5d26487f693065ae0

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