Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35846d691d1f470…

MALICIOUS

PDF

85.0 KB Created: 2021-06-28 17:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 35f3d2a44c5df4ac834097ea05765a89 SHA-1: 74252fe2ead0ff1bfb0ce364846eff40b21fffab SHA-256: d35846d691d1f47028de290db24124cd6959017d2ec96814dfcd36a5756e94a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The ML classifier and ClamAV heuristic strongly indicate maliciousness, flagging this PDF as a phishing trojan. The presence of multiple links pointing to compromised WordPress upload directories and disposable hosting suggests a link farm designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a56fc661cc---birufavoz.pdf In PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/fe6654397ad5b33bd12b6867440e4c9f/jexotiwenojisata.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/zazuvudirosotamuw.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/wonokasebekafoxexad.pdfIn PDF document text
    • http://short-story.ru/upload/file/9694031877.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b00943e29---pibififibetadi.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5d1a89375---mozisabududisetoxurego.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d393f0f8de6992d2018dde3a108d0727/kufokolafivedexulubenogu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745eabd447d---zifeliwigorosexad.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a011276079d---begilinemipidugadapunijel.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9f5644333---mijifirezaz.pdfIn PDF document text
    • https://agermag.ro/mm/file/23836557480.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/33649029452.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076843e40ea9---derudapuzadinevubow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d4add5bb9---jifirejakad.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/2irh7ucurov9dbsgneu5mkviq1/fujesakigaguwi.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/47acedc5c2b7bd05ec1d77addda9acb2/fidixezivo.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/fusagafov.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/4801a019972b1d2c62a859ac3502fe17/vavezuketifibijejo.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/semene.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807963031d9---rapirip.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/49d7182ecd43ed978e38586e5dad5d46/vovitotirufegojovu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/40059924749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=brain+cell+drawingPDF 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_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BC 17108 bytes
SHA-256: 83615d484049bc06911dcf8d8721dc51a580b4a16fe3a099796ae1ff88533bdf
font_02_sfnt_off00012fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCD 10296 bytes
SHA-256: 8cbf1e50f78a6097be6e806330cbda36c50d647988ba8ce5697359ce171d5dbc

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