Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a05e1e5e63fce7…

MALICIOUS

PDF

96.2 KB Created: 2021-09-04 04:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 382268f2046dd20e45d6cd112463b194 SHA-1: b76ea7b6193fdaf5d75445d282e8c9be94719b03 SHA-256: 90a05e1e5e63fce76b46a4dba5471fe6acda344c1717d384922b591f60914dab
192 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, indicating it is designed to redirect the user to malicious websites. Heuristics suggest it is a phishing lure, potentially related to invoices or callback scams, and ClamAV confirms it is a known phishing trojan. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 9

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • 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 https://synerhu.ru/uplcv?utm_term=provident+fund+act+1925+pdf PDF link annotation
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2efc5179---22368729593.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/midumoru.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/72606200255.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/15230211558.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/jotoxujawo.pdfIn PDF document text
    • http://arlingtonhigh1960.com/clients/881088/File/27682932168.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/mk4emnl526gpg8cabeevn71q8p/reput.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/d5428958b6882f2ec30da9c4038b7c87/tumuw.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d2a0e9fce---pasif.pdfIn PDF document text
    • https://harom.ro/files/file/56605087587.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5dde5cd39---vatusususufigalekerusesu.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/sigatugu.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/nv184d88deqcanvbs25f31fi11/belokaz.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/b781d24cd66f96f24a6fcb5722056d14/dajepibabaxumepekopigesi.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/fuzivor.pdfIn PDF document text
    • https://badrivishal.com/media/30270580158.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/27514029936.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/99971912307.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/logemumufigek.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/popadabonagumikapevuv.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f451b26e8bab2a6871ff5cd8a58327e2/5839526201.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161146066ce7cf---sudadiwedoxilopeki.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-7/20210507075806156597.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b4b0fecc761ce9ba38e693c53e1c292a/tukodasibuvil.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/9685344473147fd42aab90a49a2ae11b/giruxegezojitowomunozaw.pdfIn PDF document text
    • 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_off00011038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 11040 bytes
SHA-256: 5f3a33d5ebe68835deeb7b18786215d0c1dd253bbb0ee9b1ec20bb989e9a4a05
font_01_sfnt_off00012a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A31 18772 bytes
SHA-256: 45737edba729a0037fae679b9607b2055addb4e3733a878ed84d21ea90d3fbcd
font_02_sfnt_off00015b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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