Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00539632251808a…

MALICIOUS

PDF

94.0 KB Created: 2021-06-24 00:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d9a2a5724586ca61474b0b84129b9642 SHA-1: deab1cd5e1a43f53ae8ed20b79b628e094e51652 SHA-256: b00539632251808a26858f4c73621864bfeec11775839adbcf06178d4e78f857
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://laborke.ru/uplcv?utm_term=audacity+manual+pdf+english PDF link annotation
    • https://motelandratecuci.ro/userfiles/file/furemaburodewez.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715221bb794---7847411420.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/85465174922.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c6d12483654ce12ca7bf9662ba6f8980/sogowizofefaratujosan.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e07e3ace3d---jaxuzubujakosiwisafiwewik.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/9140592694.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c565b3478e4---22156713242.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a26767e863d---peluporezeba.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8abfc7147a71b506dc52d42a12b9122d/gebekenu.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/gawiredefoparifumumixop.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/oj27m1o5t0m73ii7u5e92eabr6/21888326598.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/1f85f8862322452d3c9af3ed91563679/vizifoxaxij.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f83f6f8a1---rizivunibavosur.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2432cc03f1---matusasefuxalok.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d513f0b53---77975091443.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f5551e43e51f4a8bcd834a5633ce10b8/dazufeloguse.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad794b3bcde---nomijuxakixozejuka.pdfIn PDF document text
    • http://df-foundry.net/d/files/jiwesinizudateduxabutew.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/12694219328.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001165c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165C 3144 bytes
SHA-256: be0de2888fbf5144aa34cd75fce36326b2c273b85ea6c2433ee48dbcc2217cb8
font_01_sfnt_off00012197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 5336 bytes
SHA-256: 84dfb4638906a1c5aaf596e8068a461951eeb0e0e5c96db22a1c491ecae95d2d
font_02_sfnt_off000133a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A1 11972 bytes
SHA-256: 1bcbcba331a09b9fbacce22f19459ecb8cbe923953eb55ab32f04c6e4f35af48
font_03_sfnt_off00015bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF6 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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