Malicious PDF — malware analysis report

Static analysis result for SHA-256 752a6a9aa569e74d…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 22:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0f49062328067668b51583ec9a443fe9 SHA-1: 4e99dc919fb04090af328c61eba1cf627b48a56b SHA-256: 752a6a9aa569e74d074f06c5aba8990474f337e6e5a7b7134c455bfe3c009998
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also acts as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://coffotea.com/uploads/files/202109162118378244.pdf In PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/11fe2fd2fe61fb0ad12f6b535793f9d9/jejifenofomapa.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/60479662729.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021092909562511.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35f195672---guvawuzelu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146f894c5026---44164947757.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/80390013156.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/29513839809.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/pezifetejoxuv.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b2f16dde3---geliki.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/lededejikilamepuzituwa.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b08488ebbf---kipuvametol.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/wewozaxaridudiwofuraxu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423eaac9514---nuruwegugufibaba.pdfIn PDF document text
    • https://haidangpc.com/contents/files/zuxodez.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///1534716906.pdfIn PDF document text
    • http://klpa.net/userData/board/file/suwodipomutomaj.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/girirufuxefusot.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/93913026855.pdfIn PDF document text
    • http://dd-eng.com/files/files/juxuloxuduxilorabagotoda.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/33953629272.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ddb52bda5b---sajirupuxilirutazegem.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/donuz.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/sebowepe.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/zemilutomuribegogunamod.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/livumezonumumolibekaforuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=torpedoed+meaning+in+tamilPDF 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_off0000b243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 10528 bytes
SHA-256: ecfc7064ec31caf02736d5c64580077e99642989e88874fb0e9176afd56ed84b
font_02_sfnt_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 15588 bytes
SHA-256: d72e28cfeeda60481f4fc1d72ba53316bbb652b4f085b46b7ebdf54d4c4741d8

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