Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b7ec92531b2b52…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 06:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14f40ed04bf8e83bf0ad0b1d8069c090 SHA-1: 732b4cbb2ee5ce9203994327e9eb7f886c49acbd SHA-256: 18b7ec92531b2b52cff4d088232188b6bfaab35346590ffdbc8ba4399cb91471
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. The primary purpose appears to be directing users to external, untrusted content, consistent with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ecosolar-energy.com/piceditor/file/sidapabuti.pdf In PDF document text
    • http://tiszaladany.hu/upload/file/80841426611.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/p3gn75t76tolls6ruuhmifnjgg/34033622404.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/rejefokidaw.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611e250e3f81c---70424284839.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160984479f18ef---juvurilekudugifunukulod.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/duposi.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/9122270039.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610a31ad4cf0a---86921858314.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/59687520871.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822887df57b---56803815411.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xawux.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c395f21b---rakisakigitirom.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/jinijaparutagupenebiz.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/zaxobadejas.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/68101727643.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210901080107.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/vazuwotutalipupofu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf6d297d4b---78281780614.pdfIn PDF document text
    • https://aashianarealty.com/file/91440682945.pdfIn PDF document text
    • http://lossfundraisingevent.com/clients/f/f5/f5ed5e364f2f51aa46a4c5982fab9a07/File/buwezapuxil.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/wogurajesulexoji.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/hb7eqq9lqkgh1bll8kuo576q63/juxokulo.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/4521203071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=list+of+subject+pronouns+in+spanishPDF 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_off0000e117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 10860 bytes
SHA-256: b3b024f418299db4917d24ec794f1e329bfb9c583eb50f54db4a5bdf1ad67c29
font_01_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 19624 bytes
SHA-256: af43d675fc10344f5cb8ad0fe24c84bf612f0121fe79f6148cdd7e7b3e7ce6c8

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