Malicious PDF — malware analysis report

Static analysis result for SHA-256 58beba9a6333744b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 04:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 580b5c534ae33b0e27286c0187988d42 SHA-1: c94872332465377eab48d680591f4597b0d9e505 SHA-256: 58beba9a6333744b0d4e11d18edd2f3599221a035415630ce045b66976d8643e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/90a257fb212d7865c8e053b6b2f3f02c/kiwapodapateburekowepe.pdf In PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/3c2d1485eb3e7017ae1403fd61c75d41/61140256661.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9b1cee3210bffa3f5581dc0cd0a23cc4/ruwogezo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fe9bc7039---paxezisawa.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/78154817373.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3d68cf38da5be9b6d31d87d5119be119/35012224463.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/772fd8e2b6f9b051a16cada9b6eabf7f/83694034937.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/94328364000.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d0c3c2fc527d5b4854617caf8bef28e1/43729882281.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/51532c06b654608c22cd4f67bc448a70/jiwixekutetetodu.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/96451031306.pdfIn PDF document text
    • https://razredna-nastava.net/files/maritemiburivilavaza.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/21547624809.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16106ccc333b02---68390350019.pdfIn PDF document text
    • http://healthywithhart.com/res/file/jufozemoroso.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa69d8e592---53770799380.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/zusubuvusanosefana.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/00naclruif43uc0ovnar3434at/36890069675.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/febibujupoxufifibufobolij.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/bodod.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/wudukew.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/7476466380.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750f02b20ed---51632728668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=inspector+clouseau+theme+pdfPDF 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_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 18916 bytes
SHA-256: 389f9b69cccc162173b44ba92110d7870502c9797a2108c799167bcef4a5d4db
font_01_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 10844 bytes
SHA-256: 457259e9311b863dad1be5406c7bd4efb1c3e492bdfa65ff3a89271c005e778e
font_02_sfnt_off00012d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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