Malicious PDF — malware analysis report

Static analysis result for SHA-256 618c5bcfe8797223…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 19:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: db38af6ea9625de9bd9bdaffd2ed78b4 SHA-1: e5c2fe26423fd025f42ce9df73a961489c941c10 SHA-256: 618c5bcfe87972238f474413d48ea734fe00f350c924b193d7d473b5f306a82d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress upload directories or are hosted on disposable domains. This indicates a likely phishing or malicious redirection campaign designed to lead users to malicious content or further compromise. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://www.tristar-technology.com/ckfinder/userfiles/files/sejolizasajexumevifojes.pdf In PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161144984911bd---vipodewokovixarelewu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5db8f289d---68159243836.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160beb46b2bd9a---lexogomujibigu.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/58883008772.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/58802408780.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/89689895524.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/2a5672cf98db36c7f611fbcf0c5597d0/96319685682.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/84069be7328bd7b10ff36502293d6500/tufugogifabovo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16081151666a5e---91075382270.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0u5jtj4mf4rga70sav0ahls42/jugoxaketivodi.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/fivepativilaronuda.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/xutakajatejuraz.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1c3a7f5ca---47173408768.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076387ff109c---fizabudixipes.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/45768927570.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa7efe8c09---kewufiwebewevonenoxaw.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/21246149950.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f64f708bc4---67041770778.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/41974780366.pdfIn PDF document text
    • https://landi-bg.com/images/file/3415795484.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210722160939.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160837ac20be2f---15613960564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=acidic+soil+effect+on+plant+growthPDF 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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 10964 bytes
SHA-256: 119e062f6e4438b8d0032015d482f40adc6165a4d3aa0088ecfb1a64b6e64614
font_01_sfnt_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E3 17700 bytes
SHA-256: aad388c2083415d40a63444b0fb07ca4a529e7a26d5d3b16747d6f9e504b3477

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