Malicious PDF — malware analysis report

Static analysis result for SHA-256 042f7f033490c248…

MALICIOUS

PDF

89.8 KB Created: 2021-09-13 21:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea49f42c85922f308a5269dce4568600 SHA-1: a440db5b08687f5233650c4f99718733a30d38f6 SHA-256: 042f7f033490c2482d2b6ee48ddfc208c9e3a74fa386d8de008c9372eca620f7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript stream suggests an attempt to execute code, potentially to redirect the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://clearpatth.com/userfiles/file/bidasadow.pdf In PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/75988360443.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/sexakuluxerofeda.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/74924025351.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/mimijosewakamijoja.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/8337078566.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/95832156576.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abff97b7a8---70249397539.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/6114321165.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/48405175443.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/54e06dc3057f8f0b9bb3406ab1dd5dd7/gesuzefemadabiwera.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/91696501467.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/59030294345.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3e913794b92aa18d743ea66e64b7bb43/12324486770.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/74480689830.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/rizuxapat.pdfIn PDF document text
    • https://andhimazhai.com/images/files/lazazefida.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1a92ac9472f7dafb020dec5b727183e6/juxutibajixekovamamikumok.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/9ebd2ce8e5e79d8b4b84de545d375203/26244576029.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/bafebirizum.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/dipujozivegovoditivux.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/58396228948.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/nemodasuzigaz.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/netunapubevijid.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/27847061505.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/55045691621.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///sapenom.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c43ebae01---junikenelupuverelub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+adventure+games+for+androidPDF 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_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 16904 bytes
SHA-256: afdc893bdae2ffda80ffce64a585ffad958ea6dcb836be914cb6400827e3a0dc
font_01_sfnt_off000127d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D5 10868 bytes
SHA-256: c552751066cb511be88bc7181bd6ddba319626abc66eabeb8567ca6bed487dab
font_02_sfnt_off000140d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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