Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39e689da9783127…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 01:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e973c1b4e1e7d5e0660950a47117a325 SHA-1: c11f80c32517b6e8052390754603ef95b52dc3a3 SHA-256: b39e689da9783127d34c8737aedfb4e29d965aa26fa4ded5c793b0400c1de4f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm characteristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://pixomot.ru/uplcv?utm_term=building+spelling+skills+grade+3+pdf PDF link annotation
    • http://cuacuonbinhduong.com/upload/files/39848287705.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/1db9f93877002c010534824cb5104239/moxadepanawatu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c43f1fefa62---beselokujijewebaneruj.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/zejaverexolokujovirekepa.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/bikawedirifu.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/13581005812.pdfIn PDF document text
    • https://scalper.ir/data/files/file/ralitatidotuzoguposelibo.pdfIn PDF document text
    • http://debten.net/UserFiles/File/89010881740.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/50917110442.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/luwojutemit.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/lodalabegakogamasaf.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210823_26F08506EAD52F6C.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/83464673597.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/cce24ee329efa01b395dbb3929500474/nopodi.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/79780596160.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/bigilufi.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/wapopepixog.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/mepulikizuxewixif.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083da8026920---simebovusura.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/1521c4684bb0b291341bfec55d267255/37992113683.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/57835481306.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/9094422838.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082608e16f3c---dajavufiwuvix.pdfIn PDF document text
    • 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_off0000c7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D8 10872 bytes
SHA-256: 2324e71abb82b0dee9c096d0d3ccdb79b55c333443a5caa1a2561ec0a734b8cb
font_01_sfnt_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 17264 bytes
SHA-256: 4d1b9ff7360292cb9cc4c77ca1f793843358beb45e25de77546c5b15bc69573f

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