Malicious PDF — malware analysis report

Static analysis result for SHA-256 853f1458150d57fc…

MALICIOUS

PDF

93.9 KB Created: 2021-07-04 09:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 11234d8feec0dbcb16484f59394717dc SHA-1: c21960fe5b2e2843a11810a935f5de073fdfe9a0 SHA-256: 853f1458150d57fc81fb2dda667956993714c6bf8e677deaa0c1cf3d68ea6496
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple compromised CMS upload directories and disposable hosting, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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://styliststudios.com/imagesTE/file/6277561382.pdf In PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a090f06c0b3---48663667390.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/daniludeg.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/18947454876.pdfIn PDF document text
    • https://inifd.london/uploads/file/tigesafotolixazivogavirew.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/lidufuvovobixurifuniga.pdfIn PDF document text
    • https://robertbah.si/files/file/kuxovagubajawesuk.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/61232596571.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/3b51176c5bed4b6181b739d421fdd445/64780994390.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748f866d67a---guvugubojiz.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///bidokanebeb.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/96025522008.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/wivufikaba.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a5664ac66d31c85eeacd7315207da1f4/borofejegizinowa.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/70664425402.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/lopamonuvemopuweto.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/c60a740548d0e60e10a2bd665cd2e782/11799957343.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc923a8691---34976637427.pdfIn PDF document text
    • https://termoformat.md/img/files/mutusopanejuxerutiromegup.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/gimetikuzep.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/2998876436.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/19554690576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gel+filtration+chromatography+notes+pdfPDF 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_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12281 17624 bytes
SHA-256: 5f6479581aa75acc78f03bc6aa8b4bc933152e98b69fed8c4f72f7ff42939804
font_02_sfnt_off00015075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15075 11220 bytes
SHA-256: 343e331527d14980b69084b578767b9497ab995be23b27a0703f1c341406133a

Open this report in the interactive analyzer, or submit your own file for analysis.