Malicious PDF — malware analysis report

Static analysis result for SHA-256 d098b157383deee0…

MALICIOUS

PDF

96.3 KB Created: 2021-07-03 00:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 08ac31b1e0636a81bd0e0100f949ca14 SHA-1: c9c3e239f92f0da86e212fcce596f174fb9db6a4 SHA-256: d098b157383deee016445ac7f62327d22b5f238b6926a9b6024229927b2134bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites utilizing the FormCraft plugin for file uploads. These links are likely part of a link farm designed to obscure the true malicious destination or host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e27b662a---83528168653.pdf In PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2cc31821a---vosuwebugapifetakuguva.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/65387794421.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a4d97521c---sadumenipun.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084f928d2616---44914424206.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a31cfd72b9da9bed00cf4dee672b5f36/54746961973.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b561b0604---lewumopipeki.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/dusil.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/sugofi.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/gijalawodezev.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/27351856946.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c6b4e2a423681cc647d9654cb23484b1/widezegilemudow.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c35ca0568---zavisebosi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dfa5423ba---48551861301.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/051ca9f9addb9adfafd17ff076d94308/32756445960.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/fezeluj.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/bojuluxisuvitezepisekiru.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/78378116697.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/99392388853.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/27188c584abcc1699fa3150407db2023/tisojopu.pdfIn PDF document text
    • http://dogable.de/userfiles/file/liwuwelavepejarujetivuja.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/oko6mbr9uvha83s63d0h20v811/84494228035.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/fiduxofirezazipat.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089a685d1fa7---jubavasese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=prom+hairstyles+for+natural+hairPDF 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_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 17016 bytes
SHA-256: a80a6bb5e67d84f01637d6fa998dbe27ce2ecc8ca1266b4210fbed1de21e17a1
font_01_sfnt_off000141dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F4 10692 bytes
SHA-256: c8847d6e0295e395a4429a1bb58e80c6c974728f956a0563bf8a3e2d5ab002aa

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