Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27cf4c53d54c10c…

MALICIOUS

PDF

77.9 KB Created: 2021-09-27 04:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b011588c561e18e0fd1a97e65a500a11 SHA-1: 761e2b750cb79665ea797e424af32c2c2c6d11e5 SHA-256: f27cf4c53d54c10ca3522d7603f18a1ed8f77ad7376ab884fcebc2c28ce4b85c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan-like nature. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely intended to redirect users to malicious content. The presence of multiple compromised upload links suggests a coordinated effort to distribute malicious files or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424207a1cab---17311701705.pdf In PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210915_CBF6F48B501E470E.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/23024334754.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/17976356062.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471f2b3a0d5---lexokepipuzujiraxeg.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/binofuxokajijubefi.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/58698989158.pdfIn PDF document text
    • http://haai.org/upload/file/84503993131.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/69002943053.pdfIn PDF document text
    • https://davnosti.ru/upload/dokanajuvavufawaponi.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/sefakevinidikuxi.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/likoxilavikafomu.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/40903333191.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/budonamozobewafevegosorup.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e4d57ef2a---nuzowug.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/9435949969.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/29118613096.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/rufujupiwipetalijinu.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/gexona.pdfIn PDF document text
    • https://hinaweb.com/upload/file/27356291991.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/30991866987.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613711b77c286---vumawedowagov.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/65426579202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mac+kindle+to+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_off0000c599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 10428 bytes
SHA-256: 4ded4302dfc752f3586abdb9ad102ba7f3597cd0ccabf298fae9fcebb45d9cd2
font_02_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 20260 bytes
SHA-256: 56caa57f351392257a8a9e5c2b5e0c1bc99a848380fb2a5315eafec580c23751

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