Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99873bdf97a30c8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 08:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b2f24185c42ea8fdecdc145b0127cbef SHA-1: d5953db04bd81c307a08560a206fa908aafe17ac SHA-256: d99873bdf97a30c8ed415ac23d4cf36e1d4ee485304eddd16cc6251b58a2835a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests an attempt to lure users to external resources, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://detaycopymatbaa.com/userfiles/file/sebinilevefonis.pdf In PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/db9b516db2a4b6899388a9f436532191/tomis.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/rotidosopifebepe.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/6763672314.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/feb123bcc2743cb8a9d775e5b78579b7/lomakadilu.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/lexuloruxekagebewovarifu.pdfIn PDF document text
    • https://nistd.in/userfiles/file/zukoro.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160726d4870ed5---xofutekakipilatupesoki.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/lureke.pdfIn PDF document text
    • https://somogyplusz.hu/files/61668620554.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/pusim.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/79418569096.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/fupalevafokopajalafawup.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/31992076631.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160baa3536c73a---murepazufijopotat.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16081722474df5---83706034243.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c59c8403d71---55857982981.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/relidozuwunozakoruxu.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/jisomapizarutupafesupob.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/88001361002.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b50facdca6e---latudapope.pdfIn PDF document text
    • http://fkhd.cz/data/img/kaparisemaziwawox.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/38165334588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=angina+pektoris+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_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 16892 bytes
SHA-256: d13508940088fca187c0edafb8ba1aecfdd63c4a29146579e48f9378715b9572
font_01_sfnt_off00010ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 10700 bytes
SHA-256: fcf77c0f0bfbebe9f00f2ccf586312e993e7ad346dc79370dee430bb6d383c05