Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd8454ce186cd80…

MALICIOUS

PDF

75.6 KB Created: 2021-09-08 11:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9fa285bdbd805ff6d78bcca470fdd69c SHA-1: b15b41b9164aeeecc8bba249fa7071609f79421c SHA-256: edd8454ce186cd809d0c093ef16b9ac4576e39ddf4692352048a57f4a012b3e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm directing users to multiple external URLs, many hosted on compromised CMS uploads or disposable domains. The primary function appears to be redirecting users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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 http://francescofesta.it/userfiles/files/33492388131.pdf In PDF document text
    • https://mudraconsultancy.com/uploads/files/25022006330.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/xumatovizonatakaroveza.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/dudupedujip.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/3ba5178186527ac0cabb7a7d92295dbd/85866390492.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16111940f2e494---35696212405.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/mefaxumobatokebix.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/vakesalawodoru.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df74dc974cc---kazemugabige.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/kobumugenefalola.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/57347997986.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/78191220287.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/125b3f37f85035647bbc7f4df76ee461/zivuxagowesunusuk.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202172802109589.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073aaa1301cf---80723645697.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/9062346235.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16081765e53a38---xubotimiteg.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/74587887730.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e66e3b602e---16380520668.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096900907110---bajojozazuwifezejuwed.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/99790162589.pdfIn PDF document text
    • http://cmepta.com/clients/7/74/74ea2f63c40943e6497cbf70acaf7c81/File/nikilafetikawofafa.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/tinekujopurudogesudemobod.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8fe6c8c030bf6c86f4f91e3f800d81d7/29762877320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=all+nigerian+food+recipe+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_off0000c5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BD 10508 bytes
SHA-256: b8e42e0d1c57fc863886f89acdb1523723b78cd51e2362b0c5f825433e9d9142
font_01_sfnt_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 16876 bytes
SHA-256: 4b9d52027e57a6d4b9ae72de6dc130c4fafac3edc8391c6b9c14472ae62a4772
font_02_sfnt_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1