Malicious PDF — malware analysis report

Static analysis result for SHA-256 0992e8fe2e73f694…

MALICIOUS

PDF

87.1 KB Created: 2021-08-02 21:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37cfdd014fe96e68d4e1fefdb626e905 SHA-1: 81103acc96bf34a3d227cdc09383dde944300f7f SHA-256: 0992e8fe2e73f69413ceacdc0bdad6d7dc0b2795900056a38288f3c65455282e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document's structure and embedded URLs suggest it functions as a link farm, directing users to potentially compromised websites or disposable hosting, likely to facilitate the download of a secondary malicious payload. The presence of invoice-related language further supports a phishing lure for payment scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://yaeram.com/userData/board/file/53734776380.pdf In PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5761a3df9---12092055350.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc885b008d---nuwovuvekubizumatabomulej.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076230937122---83117641953.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad9bdce4d---bunenezafumatos.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8e18ef94d145cfefa2958e71369fce91/36390302632.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/pusabilatigijaxobefa.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/89714818367.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/fipivebirisafoweke.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/25792686902.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/66596083877.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/183e89be878f9ad9df25b25c6ff97d99/xopipekivefusepagop.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/kupumoxar.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c816eb48ed---rutiromozusi.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4d14f579001bbded5b6281260692baa3/99743479087.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a573853e5560897c25d4ee0101eae288/45910448267.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/305ee4f869d42f7f5dbd62337ebbad6e/57269127472.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/f9ru42lvod1t8vo56rkummkhnc/diperibefixalalonepuvi.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/3989126778.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/95004029543.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8916848c9de537f44d1d09c50cd183f2/sigedomuxarezug.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e77c5fdfa---86320226600.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/37d54eaf8db5d75aa66eb20c8c98e8dd/xudesapik.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503045240115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+make+authorization+letter+for+getting+psaPDF 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_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 11132 bytes
SHA-256: a5a8a451f17597050cad9091a0adff529e75114c5858dc13ec39abc1c602c56a
font_02_sfnt_off00012079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12079 16848 bytes
SHA-256: 61b870414298f655637c7d7b8f10aa62bcc876634ed2f98e180ffb1b8df3875a

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