Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03cfeb94b6d8100…

MALICIOUS

PDF

73.6 KB Created: 2021-09-12 09:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: aaa711f9b57823eeafb476a816139a27 SHA-1: 8d9ce181fe34bf4db83ac4c83ad6fc1013dc605a SHA-256: c03cfeb94b6d810031254a922c32a80acc370fc745ad8d944f9ddb2c3a03d717
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, many hosted on domains flagged as disposable or potentially compromised. The presence of a 'download button' heuristic further suggests a lure to download a payload. ClamAV detection and ML classification strongly indicate malicious intent, likely to deliver a secondary stage malware. No scripts were extracted, but the overall structure points to a downloader or phishing attempt.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pokemom2.com/uploads/files/40544604530.pdf In PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/winipowobuxunam.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/86467380171.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/6167682361.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/74630476622.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/22248673564.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/66368953078.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ce709026---28813876679.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/18025374875.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4abfa72e2d974727caa6849825cc7f87/97934564181.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/30844955716.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161359d488fbca---xugowu.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/90091569894.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210908195317.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/vatefiriwelerudesidefel.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/39817471320.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/togipuzikuzo.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/roxoguderon.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/semitaruxalovep.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/dbujjh8qouaaukhcc8j6e9nphg/wodix.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/75549567201.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/3975052215.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/78380616677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=usb+dvd+toolPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FB 9864 bytes
SHA-256: 8ceeb03a13ef8f3ed6b3df2fc8e2f864665d18950e8092ec07db2428028cd107
font_02_sfnt_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 17460 bytes
SHA-256: 950054e88cc290e4fa7bb13f3d4ee1b3200cf6777c2b6f5501f830a1560960cc

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