Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb38b0ef1d8e69be…

MALICIOUS

PDF

89.5 KB Created: 2021-07-19 15:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f057168a4e1592c5a9371cf9c0ee81c SHA-1: 09327ae74cb6e95e80e7be053859b439ad2580ca SHA-256: cb38b0ef1d8e69be5f3a5c8f32112aec2a03ad1b6cf6b93604586e71fd3a16f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised WordPress installations. This suggests an attempt to lure users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ludifrance.fr/userfiles/file/berunezosasexafu.pdf In PDF document text
    • https://nabijdefossa.nl/upload/files/desiraju.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8b439dd4a---fedegotusudoberigure.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/xovawogivelasojinekex.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160712758912a8---99888572770.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/fomibitogevawivizu.pdfIn PDF document text
    • https://kopari.hu/files/file/13727295942.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/90478696605.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b7454014f0f---mojuzokujokunogazimizup.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/2a90872865e5180a536609e91f9bb4b0/97980430054.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c62b844533e---bibojeditebedomeb.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/pebep.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ca773a3c5---duparisojazolari.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a87c9f00da---55841369011.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/godakowoziwoxoburonixes.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dba02533f---lufonoxedefupimakakiwaz.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/5a7470a68e1d9ec42e61470d791b8c6f/25108296619.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/e32c5c09efe9350022d85b72a6c3feb1/vines.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a51248db1b7---56695346852.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/kalunegabom.pdfIn PDF document text
    • http://scro.ru/pic/file/51224500953.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080de0f4dcca---pinon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=being+sarcastic+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_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 20028 bytes
SHA-256: ead9e4c0e704c4231c554f84f020215938565223233cf85898fd1c5ab546c486
font_01_sfnt_off00012790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12790 10460 bytes
SHA-256: 0d3d8e03f776b8af0ffa75f5b85ae546b0c2327fdb8fc9b7306501712bcf77ac
font_02_sfnt_off00013f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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